Janine Razze | University of Florida (original) (raw)

Papers by Janine Razze

Research paper thumbnail of Whitefly Predatory Lady Beetle (suggested common name) Delphastus catalinae (Horn) (Insecta: Coleoptera: Coccinellidae)

EDIS

This EDIS publication is an alternate version of a page published first on the Featured Creatures... more This EDIS publication is an alternate version of a page published first on the Featured Creatures website. The Featured Creatures collection provides in-depth profiles of insects, nematodes, arachnids and other organisms relevant to Florida. These profiles are intended for the use of interested laypersons with some knowledge of biology as well as academic audiences. This 4-page fact sheet that discusses Delphastus catalinae was written by Janine Razze and Oscar E. Liburd, and published by the UF Entomology and Nematology Department, May 2017. EENY677/IN1172: Whitefly Predatory Lady Beetle (suggested common name)? Delphastus catalinae (Horn) (Insecta: Coleoptera: Coccinellidae) (ufl.edu)

Research paper thumbnail of Florida State Report on the Spotted Wing Drosophila 2015

Research paper thumbnail of Biology and Management of Aphids in Sustainable Field Production of Cucurbits

EDIS, 2008

ENY-847, a 3-page illustrated factsheet by O. E. Liburd and T. W. Nyoike, provides information ab... more ENY-847, a 3-page illustrated factsheet by O. E. Liburd and T. W. Nyoike, provides information about aphids, their biology and lifecycle, damage, monitoring and management strategies for sustainable agriculture. Includes references. Published by UF Department of Entomology and Nematology, January 2008.

Research paper thumbnail of Relative captures of grape root borer, Vitacea polistiformis (Lepidoptera: Sesiidae) in pheromone traps within vineyards and adjacent woodlands

Crop Protection, 2018

Abstract The grape root borer (GRB), Vitacea polistiformis (Harris), is a significant pest of gra... more Abstract The grape root borer (GRB), Vitacea polistiformis (Harris), is a significant pest of grapes (Vitis spp.) throughout parts of the eastern United States. Early detection and implementation of management tactics can prevent economic losses and vine death. The establishment of an effective monitoring program requires the deployment of pheromone baited traps in vineyards and native wild grapes. An understanding of the spatial distribution of GRB infestations is critical for the development of sampling plans and for implementing management decisions. Wing traps baited with synthetic GRB sex pheromones (99:1 blend of (E,Z)-2,13-ODDA and Z,Z-3,13-ODDA) were deployed in commercial vineyards and surrounding woodlands in wild grapes to monitor GRB abundance and distribution. In addition, pheromone-baited wing traps were placed at low, medium, and high positions (0.5 m–2 m above the ground) on the grapevine trellis in commercial vineyards to evaluate the effect of trap height on the number of GRB captured. Traps placed in the cultivated vineyard had consistently higher counts of GRB compared with traps along the vineyard edge and in the wild grapes in the woodland. The pheromone-baited traps placed on the highest trellis wire caught more GRB adults than traps placed at the lowest position on the bottom trellis wire. Therefore, we recommend to place traps at approximately 2 m in the upper grapevine canopy early in the season before flight of GRB moth begins in order to aid in the timing and implementation of management tactics.

Research paper thumbnail of Evaluation of Bioinsecticides for Management ofBemisia tabaci(Hemiptera: Aleyrodidae) and the Effect on the Whitefly PredatorDelphastus catalinae(Coleoptera: Coccinellidae) in Organic Squash

Journal of Economic Entomology, 2016

Organic zucchini squash is a high-value vegetable crop in Florida and potential exists to expand ... more Organic zucchini squash is a high-value vegetable crop in Florida and potential exists to expand its production throughout the state. A lack of knowledge on the effectiveness of organic products and their integration with natural enemies is an important constraint to the regulation of pest populations in organic squash production in Florida. The objectives of this study were to evaluate the effect of insecticides labeled for organic production that can be used for management of Bemisia tabaci (Gennadius) biotype B, on organically grown squash; and to determine the effects of the most efficient insecticides on a key natural enemy, Delphastus catalinae (Horn). Experiments were conducted in the greenhouse in exclusion cages. The first experiment compared the effects of four bioinsecticides on whitefly densities. Insecticides include 1) AzaSol (azadirachtin), 2) PyGanic EC 1.4 (pyrethrin), 3) M-Pede (insecticidal soap), and 4) Entrust (spinosad). The second experiment investigated the effects of bioinsecticides on D. catalinae Treatment effectiveness was evaluated 1, 3, and 5 d posttreatment. PyGanic and M-Pede were highly effective in controlling whitefly populations on organic squash, while moderate control was provided by AzaSol and there was no control provided by Entrust. PyGanic and M-Pede treatments reduced D. catalinae populations when adults were released 1 d post pesticide application. However, when adults were released 5 d post application, there was no reduction. The importance of using bioinsecticides in combination with natural enemies to regulate pest populations in organic cropping systems is discussed.

Research paper thumbnail of Preference ofBemisia tabacibiotype B on zucchini squash and buckwheat and the effect ofDelphastus catalinaeon whitefly populations

Pest Management Science, 2015

Zucchini squash, Cucurbita pepo L., is an important vegetable crop in Florida. Physiological diso... more Zucchini squash, Cucurbita pepo L., is an important vegetable crop in Florida. Physiological disorders and insect-transmitted diseases are major problems for squash growers in semi-tropical regions around the world. Bemisia tabaci (Gennadius) biotype B is a significant whitefly pest and is largely responsible for transmitting viruses and causing physiological disorders in squash. Several studies have shown that whitefly populations are reduced when crops are interplanted with non-host cover crops or mulches. The aim of the present study was to determine how the presence of buckwheat, Fagopyrum esculentum Moench, and a key predator, Delphastus catalinae (Horn), affect whitefly colonization on squash. Whitefly densities were higher on squash than on buckwheat. The introduction of D. catalinae on squash significantly reduced whitefly populations. Overall, there were higher densities of D. catalinae on squash where the whitefly pest was more concentrated compared with buckwheat. The study provided preliminary evidence that D. catalinae, when used in conjunction with buckwheat as a living mulch, may aid in reducing whiteflies in squash. This greenhouse experiment highlights the need to investigate a multitactic approach of intercropping buckwheat with squash and the incorporation of D. catalinae in the field to manage populations of whiteflies and whitefly-transmitted diseases. © 2015 Society of Chemical Industry.

Research paper thumbnail of Intercropping buckwheat with squash to reduce insect pests and disease incidence and increase yield

Agroecology and Sustainable Food Systems, 2016

ABSTRACT Aphids and whiteflies are significant direct pests of squash and transmit plant viruses.... more ABSTRACT Aphids and whiteflies are significant direct pests of squash and transmit plant viruses. The use of buckwheat, Fagopyrum esculentum Moench, as a living mulch intercropped with squash has been shown to reduce insect pests and diseases while increasing the abundance of beneficial insects; however, how to best implement buckwheat in squash fields has not been determined. Several arrangements of intercropping buckwheat and squash were evaluated, with and without the introduction of a natural enemy, Delphastus catalinae (Horn), to find a tactic that reduces insect pests and disease incidence while increasing marketable yield. Intercropping treatments included planting strips of buckwheat alternating on either side of the squash with and without D. catalinae (arrangement A), planting buckwheat in the middle of squash planted on both sides of the bed with and without D. catalinae (arrangement B), buckwheat planted on both sides of squash (arrangement C), and a bare ground treatment. Aphid densities and insect-transmitted viruses were reduced, while natural enemies were more abundant, in buckwheat treatments compared with bare ground treatments. Plant size was reduced in intercropping arrangements B and C compared with arrangement A. Marketable yields were not different between the bare ground treatment and buckwheat arrangements A and B.

Research paper thumbnail of Preference of the silverleaf whitefly, Bemisia tabaci B biotype, on zucchini squash and buckwheat and the effect of Delphastus catalinae on whitefly populations

Zucchini squash, Cucurbita pepo L., is a high value vegetable crop in Florida. Plant physiologica... more Zucchini squash, Cucurbita pepo L., is a high value vegetable crop in Florida. Plant physiological disorders and insect-transmitted diseases associated with the feeding of immature silverleaf whiteflies, Bemisia tabaci B biotype, are serious problems for many growers around the state. The implementation of mixed cropping systems and crops interplanted with alternative host cover crops, when used in conjunction with other pest suppression methods, has the potential to reduce whitefly numbers as well as the impact of whitefly-transmitted viruses on cucurbits. This study investigated the preference of the silverleaf whitefly when given a choice between zucchini squash and buckwheat, and how the introduction of a predator, Delphastus catalinae, would affect whitefly populations. The study was conducted in an open-sided greenhouse with three field cages. The experiment was a randomized complete block design with four replications. Three treatments were evaluated 1) a cage that contained ...

Research paper thumbnail of Behavioral characteristics of neonate European corn borer, Ostrinia nubilalis, on Bt corn

Charles Mason European corn borer (ECB), Ostrinia nubilalis (Hübner), is an economically importan... more Charles Mason European corn borer (ECB), Ostrinia nubilalis (Hübner), is an economically important insect pest of corn in the US and Canada. The development of genetically modified corn expressing genes derived from Bacillus thuringiensis (Bt) that encodes insecticidal crystalline (Cry) proteins has proven to be effective in controlling this insect. The purpose of this study was to assess dispersal and feeding behavior of neonate ECB on Bt corn. I examined differences in neonate ECB dispersal behavior for the first four hours following eclosion in the field among stacked pyramid (DAS 59122-7 × TC1507 × MON810) Bt corn, non-Bt near isoline, and non-Bt sweet corn; and in the laboratory among Bt corn hybrids TC1507, MON810, a pyramid combining TC1507 and MON810, and non-Bt near isoline corn. I also examined differences in feeding behavior between MON810 Bt corn and non-Bt near isoline corn for four intervals over a 48-hour period. In field experiments, I found that dispersal was signif...

Research paper thumbnail of Incorporating buckwheat as a living mulch with zucchini squash to reduce pest and disease pressure, increase natural enemy populations, and increase yield

The use of buckwheat as a living mulch intercropped with squash has shown promise to reduce pest ... more The use of buckwheat as a living mulch intercropped with squash has shown promise to reduce pest and disease pressure while increasing the abundance of beneficial insects. This study evaluated several methods of intercropping buckwheat and squash, as well as introducing the natural enemy Delphastus catalinae, to find a tactic that reduces pest and disease pressure while increasing marketable yield. The five treatments evaluated include A) alternating buckwheat on either side of each squash bed; B) arranging buckwheat and squash in the same manner as treatment A, however, releasing D. catalinae into the plot; C) planting buckwheat in the center of the bed with squash planted on both sides; D) arranging buckwheat and squash plants in the same manner as treatment C, however, releasing D. catalinae into the plot; and E) planting buckwheat on both sides of the squash (control). We found aphid densities were highest in treatment C, however there was no significant difference in whitefly d...

Research paper thumbnail of Modeling the influence of larval movement on the durability of Bt corn controlling Ostinia nubilalis (European corn borer): Mallet and Porter revisited

Research paper thumbnail of How do OMRI approved insecticides affect silverleaf whitefly populations and conservation of beneficial insects in organic squash?

Organic zucchini squash is a high value vegetable crop in Florida and potential exists to expand ... more Organic zucchini squash is a high value vegetable crop in Florida and potential exists to expand its production throughout the state. A lack of knowledge on the effectiveness of OMRI approved products is one of the constraints to organic squash production in Florida. Research on the effectiveness of OMRI approved insecticides for managing whitefly populations in squash as well as their effects on natural enemies will provide additional information on how these insecticides can be used to regulate pest populations. The objectives of this study were to evaluate the effect of OMRI approved insecticides that can be used to control the silverleaf whitefly, Bemisia tabaci B biotype, on organically grown squash; and to determine the effect of selected insecticides on a key natural enemy, Delphastus catalinae. The first experiment compared the effects of four OMRI approved insecticides and an untreated control on whitefly densities. Insecticides include 1)Aza-Sol, 2)PyGanic EC 1.4, 3)M-Pede...

Research paper thumbnail of Feeding Behavior of Neonate Ostrinia nubilalis (Lepidoptera: Crambidae) on Cry1Ab Bt Corn: Implications for Resistance Management

Journal of Economic Entomology, 2011

Research paper thumbnail of Dispersal Behavior of Neonate European Corn Borer (Lepidoptera: Crambidae) on Bt Corn

Journal of Economic Entomology, 2012

Research paper thumbnail of Water Resource Management

(Statement of Responsibility) by Janine Razze(Thesis) Thesis (B.A.) -- New College of Florida, 20... more (Statement of Responsibility) by Janine Razze(Thesis) Thesis (B.A.) -- New College of Florida, 2008(Electronic Access) RESTRICTED TO NCF STUDENTS, STAFF, FACULTY, AND ON-CAMPUS USE(Bibliography) Includes bibliographical references.(Source of Description) This bibliographic record is available under the Creative Commons CC0 public domain dedication. The New College of Florida, as creator of this bibliographic record, has waived all rights to it worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law.(Local) Faculty Sponsor: Savin, Samue

Research paper thumbnail of Relative captures of grape root borer, Vitacea polistiformis (Lepidoptera: Sesiidae) in pheromone traps within vineyards and adjacent woodlands

The grape root borer (GRB), Vitacea polistiformis (Harris), is a significant pest of grapes (Viti... more The grape root borer (GRB), Vitacea polistiformis (Harris), is a significant pest of grapes (Vitis spp.) throughout parts of the eastern United States. Early detection and implementation of management tactics can prevent economic losses and vine death. The establishment of an effective monitoring program requires the deployment of pheromone baited traps in vineyards and native wild grapes. An understanding of the spatial distribution of GRB infestations is critical for the development of sampling plans and for implementing management decisions. Wing traps baited with synthetic GRB sex pheromones (99:1 blend of (E,Z)-2,13-ODDA and Z,Z-3,13-ODDA) were deployed in commercial vineyards and surrounding woodlands in wild grapes to monitor GRB abundance and distribution. In addition, pheromone-baited wing traps were placed at low, medium, and high positions (0.5 m–2 m above the ground) on the grapevine trellis in commercial vineyards to evaluate the effect of trap height on the number of GRB captured. Traps placed in the cultivated vineyard had consistently higher counts of GRB compared with traps along the vineyard edge and in the wild grapes in the woodland. The pheromone-baited traps placed on the highest trellis wire caught more GRB adults than traps placed at the lowest position on the bottom trellis wire. Therefore, we recommend to place traps at approximately 2 m in the upper grapevine canopy early in the season before flight of GRB moth begins in order to aid in the timing and implementation of management tactics.

Research paper thumbnail of Biology and Management of Whiteflies in Sustainable Field Production of Cucurbits

Research paper thumbnail of Biology and Management of Aphids in Sustainable Field Production of Cucurbits

Research paper thumbnail of Intercropping Buckwheat with Squash to Reduce Insect Pests and Disease Incidence and Increase Yield

Aphids and whiteflies are significant direct pests of squash and transmit plant viruses. The use ... more Aphids and whiteflies are significant direct pests of squash and transmit plant viruses. The use of buckwheat, Fagopyrum esculentum Moench, as a living mulch intercropped with squash has been shown to reduce insect pests and diseases while increasing the abundance of beneficial insects; however, how to best implement buckwheat in squash fields has not been determined. Several arrangements of intercropping buckwheat and squash were evaluated, with and without the introduction of a natural enemy, Delphastus catalinae (Horn), to find a tactic that reduces insect pests and disease incidence while increasing marketable yield. Intercropping treatments included planting strips of buckwheat alternating on either side of the squash with and without D. catalinae (arrangement A), planting buckwheat in the middle of squash planted on both sides of the bed with and without D. catalinae (arrangement B), buckwheat planted on both sides of squash (arrangement C), and a bare ground treatment. Aphid densities and insect-transmitted viruses were reduced, while natural enemies were more
abundant, in buckwheat treatments compared with bare ground treatments. Plant size was reduced in intercropping arrangements B and C compared with arrangement A. Marketable yields were not different between the bare ground treatment and buckwheat arrangements A and B.

Research paper thumbnail of Evaluation of Bioinsecticides for Management of Bemisia tabaci (Hemiptera: Aleyrodidae) and the Effect on the Whitefly Predator Delphastus catalinae (Coleoptera: Coccinellidae) in Organic Squash

Organic zucchini squash is a high-value vegetable crop in Florida and potential exists to expand ... more Organic zucchini squash is a high-value vegetable crop in Florida and potential exists to expand its production throughout the state. A lack of knowledge on the effectiveness of organic products and their integration with natural enemies is an important constraint to the regulation of pest populations in organic squash production in Florida. The objectives of this study were to evaluate the effect of insecticides labeled for organic production that can be used for management of Bemisia tabaci (Gennadius) biotype B, on organically grown squash; and to determine the effects of the most efficient insecticides on a key natural enemy, Delphastus catalinae (Horn). Experiments were conducted in the greenhouse in exclusion cages. The first experiment compared the effects of four bioinsecticides on whitefly densities. Insecticides include 1) AzaSol (azadirachtin), 2) PyGanic EC 1.4 (pyr-ethrin), 3) M-Pede (insecticidal soap), and 4) Entrust (spinosad). The second experiment investigated the effects of bioinsecticides on D. catalinae. Treatment effectiveness was evaluated 1, 3, and 5 d posttreatment. PyGanic and M-Pede were highly effective in controlling whitefly populations on organic squash, while moderate control was provided by AzaSol and there was no control provided by Entrust. PyGanic and M-Pede treatments reduced D. catalinae populations when adults were released 1 d post pesticide application. However, when adults were released 5 d post application, there was no reduction. The importance of using bioinsecticides in combination with natural enemies to regulate pest populations in organic cropping systems is discussed.

Research paper thumbnail of Whitefly Predatory Lady Beetle (suggested common name) Delphastus catalinae (Horn) (Insecta: Coleoptera: Coccinellidae)

EDIS

This EDIS publication is an alternate version of a page published first on the Featured Creatures... more This EDIS publication is an alternate version of a page published first on the Featured Creatures website. The Featured Creatures collection provides in-depth profiles of insects, nematodes, arachnids and other organisms relevant to Florida. These profiles are intended for the use of interested laypersons with some knowledge of biology as well as academic audiences. This 4-page fact sheet that discusses Delphastus catalinae was written by Janine Razze and Oscar E. Liburd, and published by the UF Entomology and Nematology Department, May 2017. EENY677/IN1172: Whitefly Predatory Lady Beetle (suggested common name)? Delphastus catalinae (Horn) (Insecta: Coleoptera: Coccinellidae) (ufl.edu)

Research paper thumbnail of Florida State Report on the Spotted Wing Drosophila 2015

Research paper thumbnail of Biology and Management of Aphids in Sustainable Field Production of Cucurbits

EDIS, 2008

ENY-847, a 3-page illustrated factsheet by O. E. Liburd and T. W. Nyoike, provides information ab... more ENY-847, a 3-page illustrated factsheet by O. E. Liburd and T. W. Nyoike, provides information about aphids, their biology and lifecycle, damage, monitoring and management strategies for sustainable agriculture. Includes references. Published by UF Department of Entomology and Nematology, January 2008.

Research paper thumbnail of Relative captures of grape root borer, Vitacea polistiformis (Lepidoptera: Sesiidae) in pheromone traps within vineyards and adjacent woodlands

Crop Protection, 2018

Abstract The grape root borer (GRB), Vitacea polistiformis (Harris), is a significant pest of gra... more Abstract The grape root borer (GRB), Vitacea polistiformis (Harris), is a significant pest of grapes (Vitis spp.) throughout parts of the eastern United States. Early detection and implementation of management tactics can prevent economic losses and vine death. The establishment of an effective monitoring program requires the deployment of pheromone baited traps in vineyards and native wild grapes. An understanding of the spatial distribution of GRB infestations is critical for the development of sampling plans and for implementing management decisions. Wing traps baited with synthetic GRB sex pheromones (99:1 blend of (E,Z)-2,13-ODDA and Z,Z-3,13-ODDA) were deployed in commercial vineyards and surrounding woodlands in wild grapes to monitor GRB abundance and distribution. In addition, pheromone-baited wing traps were placed at low, medium, and high positions (0.5 m–2 m above the ground) on the grapevine trellis in commercial vineyards to evaluate the effect of trap height on the number of GRB captured. Traps placed in the cultivated vineyard had consistently higher counts of GRB compared with traps along the vineyard edge and in the wild grapes in the woodland. The pheromone-baited traps placed on the highest trellis wire caught more GRB adults than traps placed at the lowest position on the bottom trellis wire. Therefore, we recommend to place traps at approximately 2 m in the upper grapevine canopy early in the season before flight of GRB moth begins in order to aid in the timing and implementation of management tactics.

Research paper thumbnail of Evaluation of Bioinsecticides for Management ofBemisia tabaci(Hemiptera: Aleyrodidae) and the Effect on the Whitefly PredatorDelphastus catalinae(Coleoptera: Coccinellidae) in Organic Squash

Journal of Economic Entomology, 2016

Organic zucchini squash is a high-value vegetable crop in Florida and potential exists to expand ... more Organic zucchini squash is a high-value vegetable crop in Florida and potential exists to expand its production throughout the state. A lack of knowledge on the effectiveness of organic products and their integration with natural enemies is an important constraint to the regulation of pest populations in organic squash production in Florida. The objectives of this study were to evaluate the effect of insecticides labeled for organic production that can be used for management of Bemisia tabaci (Gennadius) biotype B, on organically grown squash; and to determine the effects of the most efficient insecticides on a key natural enemy, Delphastus catalinae (Horn). Experiments were conducted in the greenhouse in exclusion cages. The first experiment compared the effects of four bioinsecticides on whitefly densities. Insecticides include 1) AzaSol (azadirachtin), 2) PyGanic EC 1.4 (pyrethrin), 3) M-Pede (insecticidal soap), and 4) Entrust (spinosad). The second experiment investigated the effects of bioinsecticides on D. catalinae Treatment effectiveness was evaluated 1, 3, and 5 d posttreatment. PyGanic and M-Pede were highly effective in controlling whitefly populations on organic squash, while moderate control was provided by AzaSol and there was no control provided by Entrust. PyGanic and M-Pede treatments reduced D. catalinae populations when adults were released 1 d post pesticide application. However, when adults were released 5 d post application, there was no reduction. The importance of using bioinsecticides in combination with natural enemies to regulate pest populations in organic cropping systems is discussed.

Research paper thumbnail of Preference ofBemisia tabacibiotype B on zucchini squash and buckwheat and the effect ofDelphastus catalinaeon whitefly populations

Pest Management Science, 2015

Zucchini squash, Cucurbita pepo L., is an important vegetable crop in Florida. Physiological diso... more Zucchini squash, Cucurbita pepo L., is an important vegetable crop in Florida. Physiological disorders and insect-transmitted diseases are major problems for squash growers in semi-tropical regions around the world. Bemisia tabaci (Gennadius) biotype B is a significant whitefly pest and is largely responsible for transmitting viruses and causing physiological disorders in squash. Several studies have shown that whitefly populations are reduced when crops are interplanted with non-host cover crops or mulches. The aim of the present study was to determine how the presence of buckwheat, Fagopyrum esculentum Moench, and a key predator, Delphastus catalinae (Horn), affect whitefly colonization on squash. Whitefly densities were higher on squash than on buckwheat. The introduction of D. catalinae on squash significantly reduced whitefly populations. Overall, there were higher densities of D. catalinae on squash where the whitefly pest was more concentrated compared with buckwheat. The study provided preliminary evidence that D. catalinae, when used in conjunction with buckwheat as a living mulch, may aid in reducing whiteflies in squash. This greenhouse experiment highlights the need to investigate a multitactic approach of intercropping buckwheat with squash and the incorporation of D. catalinae in the field to manage populations of whiteflies and whitefly-transmitted diseases. © 2015 Society of Chemical Industry.

Research paper thumbnail of Intercropping buckwheat with squash to reduce insect pests and disease incidence and increase yield

Agroecology and Sustainable Food Systems, 2016

ABSTRACT Aphids and whiteflies are significant direct pests of squash and transmit plant viruses.... more ABSTRACT Aphids and whiteflies are significant direct pests of squash and transmit plant viruses. The use of buckwheat, Fagopyrum esculentum Moench, as a living mulch intercropped with squash has been shown to reduce insect pests and diseases while increasing the abundance of beneficial insects; however, how to best implement buckwheat in squash fields has not been determined. Several arrangements of intercropping buckwheat and squash were evaluated, with and without the introduction of a natural enemy, Delphastus catalinae (Horn), to find a tactic that reduces insect pests and disease incidence while increasing marketable yield. Intercropping treatments included planting strips of buckwheat alternating on either side of the squash with and without D. catalinae (arrangement A), planting buckwheat in the middle of squash planted on both sides of the bed with and without D. catalinae (arrangement B), buckwheat planted on both sides of squash (arrangement C), and a bare ground treatment. Aphid densities and insect-transmitted viruses were reduced, while natural enemies were more abundant, in buckwheat treatments compared with bare ground treatments. Plant size was reduced in intercropping arrangements B and C compared with arrangement A. Marketable yields were not different between the bare ground treatment and buckwheat arrangements A and B.

Research paper thumbnail of Preference of the silverleaf whitefly, Bemisia tabaci B biotype, on zucchini squash and buckwheat and the effect of Delphastus catalinae on whitefly populations

Zucchini squash, Cucurbita pepo L., is a high value vegetable crop in Florida. Plant physiologica... more Zucchini squash, Cucurbita pepo L., is a high value vegetable crop in Florida. Plant physiological disorders and insect-transmitted diseases associated with the feeding of immature silverleaf whiteflies, Bemisia tabaci B biotype, are serious problems for many growers around the state. The implementation of mixed cropping systems and crops interplanted with alternative host cover crops, when used in conjunction with other pest suppression methods, has the potential to reduce whitefly numbers as well as the impact of whitefly-transmitted viruses on cucurbits. This study investigated the preference of the silverleaf whitefly when given a choice between zucchini squash and buckwheat, and how the introduction of a predator, Delphastus catalinae, would affect whitefly populations. The study was conducted in an open-sided greenhouse with three field cages. The experiment was a randomized complete block design with four replications. Three treatments were evaluated 1) a cage that contained ...

Research paper thumbnail of Behavioral characteristics of neonate European corn borer, Ostrinia nubilalis, on Bt corn

Charles Mason European corn borer (ECB), Ostrinia nubilalis (Hübner), is an economically importan... more Charles Mason European corn borer (ECB), Ostrinia nubilalis (Hübner), is an economically important insect pest of corn in the US and Canada. The development of genetically modified corn expressing genes derived from Bacillus thuringiensis (Bt) that encodes insecticidal crystalline (Cry) proteins has proven to be effective in controlling this insect. The purpose of this study was to assess dispersal and feeding behavior of neonate ECB on Bt corn. I examined differences in neonate ECB dispersal behavior for the first four hours following eclosion in the field among stacked pyramid (DAS 59122-7 × TC1507 × MON810) Bt corn, non-Bt near isoline, and non-Bt sweet corn; and in the laboratory among Bt corn hybrids TC1507, MON810, a pyramid combining TC1507 and MON810, and non-Bt near isoline corn. I also examined differences in feeding behavior between MON810 Bt corn and non-Bt near isoline corn for four intervals over a 48-hour period. In field experiments, I found that dispersal was signif...

Research paper thumbnail of Incorporating buckwheat as a living mulch with zucchini squash to reduce pest and disease pressure, increase natural enemy populations, and increase yield

The use of buckwheat as a living mulch intercropped with squash has shown promise to reduce pest ... more The use of buckwheat as a living mulch intercropped with squash has shown promise to reduce pest and disease pressure while increasing the abundance of beneficial insects. This study evaluated several methods of intercropping buckwheat and squash, as well as introducing the natural enemy Delphastus catalinae, to find a tactic that reduces pest and disease pressure while increasing marketable yield. The five treatments evaluated include A) alternating buckwheat on either side of each squash bed; B) arranging buckwheat and squash in the same manner as treatment A, however, releasing D. catalinae into the plot; C) planting buckwheat in the center of the bed with squash planted on both sides; D) arranging buckwheat and squash plants in the same manner as treatment C, however, releasing D. catalinae into the plot; and E) planting buckwheat on both sides of the squash (control). We found aphid densities were highest in treatment C, however there was no significant difference in whitefly d...

Research paper thumbnail of Modeling the influence of larval movement on the durability of Bt corn controlling Ostinia nubilalis (European corn borer): Mallet and Porter revisited

Research paper thumbnail of How do OMRI approved insecticides affect silverleaf whitefly populations and conservation of beneficial insects in organic squash?

Organic zucchini squash is a high value vegetable crop in Florida and potential exists to expand ... more Organic zucchini squash is a high value vegetable crop in Florida and potential exists to expand its production throughout the state. A lack of knowledge on the effectiveness of OMRI approved products is one of the constraints to organic squash production in Florida. Research on the effectiveness of OMRI approved insecticides for managing whitefly populations in squash as well as their effects on natural enemies will provide additional information on how these insecticides can be used to regulate pest populations. The objectives of this study were to evaluate the effect of OMRI approved insecticides that can be used to control the silverleaf whitefly, Bemisia tabaci B biotype, on organically grown squash; and to determine the effect of selected insecticides on a key natural enemy, Delphastus catalinae. The first experiment compared the effects of four OMRI approved insecticides and an untreated control on whitefly densities. Insecticides include 1)Aza-Sol, 2)PyGanic EC 1.4, 3)M-Pede...

Research paper thumbnail of Feeding Behavior of Neonate Ostrinia nubilalis (Lepidoptera: Crambidae) on Cry1Ab Bt Corn: Implications for Resistance Management

Journal of Economic Entomology, 2011

Research paper thumbnail of Dispersal Behavior of Neonate European Corn Borer (Lepidoptera: Crambidae) on Bt Corn

Journal of Economic Entomology, 2012

Research paper thumbnail of Water Resource Management

(Statement of Responsibility) by Janine Razze(Thesis) Thesis (B.A.) -- New College of Florida, 20... more (Statement of Responsibility) by Janine Razze(Thesis) Thesis (B.A.) -- New College of Florida, 2008(Electronic Access) RESTRICTED TO NCF STUDENTS, STAFF, FACULTY, AND ON-CAMPUS USE(Bibliography) Includes bibliographical references.(Source of Description) This bibliographic record is available under the Creative Commons CC0 public domain dedication. The New College of Florida, as creator of this bibliographic record, has waived all rights to it worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law.(Local) Faculty Sponsor: Savin, Samue

Research paper thumbnail of Relative captures of grape root borer, Vitacea polistiformis (Lepidoptera: Sesiidae) in pheromone traps within vineyards and adjacent woodlands

The grape root borer (GRB), Vitacea polistiformis (Harris), is a significant pest of grapes (Viti... more The grape root borer (GRB), Vitacea polistiformis (Harris), is a significant pest of grapes (Vitis spp.) throughout parts of the eastern United States. Early detection and implementation of management tactics can prevent economic losses and vine death. The establishment of an effective monitoring program requires the deployment of pheromone baited traps in vineyards and native wild grapes. An understanding of the spatial distribution of GRB infestations is critical for the development of sampling plans and for implementing management decisions. Wing traps baited with synthetic GRB sex pheromones (99:1 blend of (E,Z)-2,13-ODDA and Z,Z-3,13-ODDA) were deployed in commercial vineyards and surrounding woodlands in wild grapes to monitor GRB abundance and distribution. In addition, pheromone-baited wing traps were placed at low, medium, and high positions (0.5 m–2 m above the ground) on the grapevine trellis in commercial vineyards to evaluate the effect of trap height on the number of GRB captured. Traps placed in the cultivated vineyard had consistently higher counts of GRB compared with traps along the vineyard edge and in the wild grapes in the woodland. The pheromone-baited traps placed on the highest trellis wire caught more GRB adults than traps placed at the lowest position on the bottom trellis wire. Therefore, we recommend to place traps at approximately 2 m in the upper grapevine canopy early in the season before flight of GRB moth begins in order to aid in the timing and implementation of management tactics.

Research paper thumbnail of Biology and Management of Whiteflies in Sustainable Field Production of Cucurbits

Research paper thumbnail of Biology and Management of Aphids in Sustainable Field Production of Cucurbits

Research paper thumbnail of Intercropping Buckwheat with Squash to Reduce Insect Pests and Disease Incidence and Increase Yield

Aphids and whiteflies are significant direct pests of squash and transmit plant viruses. The use ... more Aphids and whiteflies are significant direct pests of squash and transmit plant viruses. The use of buckwheat, Fagopyrum esculentum Moench, as a living mulch intercropped with squash has been shown to reduce insect pests and diseases while increasing the abundance of beneficial insects; however, how to best implement buckwheat in squash fields has not been determined. Several arrangements of intercropping buckwheat and squash were evaluated, with and without the introduction of a natural enemy, Delphastus catalinae (Horn), to find a tactic that reduces insect pests and disease incidence while increasing marketable yield. Intercropping treatments included planting strips of buckwheat alternating on either side of the squash with and without D. catalinae (arrangement A), planting buckwheat in the middle of squash planted on both sides of the bed with and without D. catalinae (arrangement B), buckwheat planted on both sides of squash (arrangement C), and a bare ground treatment. Aphid densities and insect-transmitted viruses were reduced, while natural enemies were more
abundant, in buckwheat treatments compared with bare ground treatments. Plant size was reduced in intercropping arrangements B and C compared with arrangement A. Marketable yields were not different between the bare ground treatment and buckwheat arrangements A and B.

Research paper thumbnail of Evaluation of Bioinsecticides for Management of Bemisia tabaci (Hemiptera: Aleyrodidae) and the Effect on the Whitefly Predator Delphastus catalinae (Coleoptera: Coccinellidae) in Organic Squash

Organic zucchini squash is a high-value vegetable crop in Florida and potential exists to expand ... more Organic zucchini squash is a high-value vegetable crop in Florida and potential exists to expand its production throughout the state. A lack of knowledge on the effectiveness of organic products and their integration with natural enemies is an important constraint to the regulation of pest populations in organic squash production in Florida. The objectives of this study were to evaluate the effect of insecticides labeled for organic production that can be used for management of Bemisia tabaci (Gennadius) biotype B, on organically grown squash; and to determine the effects of the most efficient insecticides on a key natural enemy, Delphastus catalinae (Horn). Experiments were conducted in the greenhouse in exclusion cages. The first experiment compared the effects of four bioinsecticides on whitefly densities. Insecticides include 1) AzaSol (azadirachtin), 2) PyGanic EC 1.4 (pyr-ethrin), 3) M-Pede (insecticidal soap), and 4) Entrust (spinosad). The second experiment investigated the effects of bioinsecticides on D. catalinae. Treatment effectiveness was evaluated 1, 3, and 5 d posttreatment. PyGanic and M-Pede were highly effective in controlling whitefly populations on organic squash, while moderate control was provided by AzaSol and there was no control provided by Entrust. PyGanic and M-Pede treatments reduced D. catalinae populations when adults were released 1 d post pesticide application. However, when adults were released 5 d post application, there was no reduction. The importance of using bioinsecticides in combination with natural enemies to regulate pest populations in organic cropping systems is discussed.