Christopher Jacobsen - Academia.edu (original) (raw)

Papers by Christopher Jacobsen

Research paper thumbnail of Estimating density of calling male Eleutherodactylus coqui in Hawaii from audio recordings of the nighttime frog chorus

Research paper thumbnail of Evaluation of White Peach Scale Control in Papaya with Applaud, 2003

Arthropod Management Tests

Research paper thumbnail of Hot water as a potential disinfestation treatment for an invasive anuran amphibian, the coqui frog, Eleutherodactylus coqui Thomas (Leptodactylidae), on potted plants

International Journal of Pest Management, Jul 1, 2010

... DOI: 10.1080/09670870903560114 Arnold H. Hara a * , Christopher M. Jacobsen a , Shenandoah R.... more ... DOI: 10.1080/09670870903560114 Arnold H. Hara a * , Christopher M. Jacobsen a , Shenandoah R. Marr a & Ruth Y. Niino-DuPonte a pages 255-263. ... 20074. Christy, MT, Clark, CS, Gee, DE, Vice, D, Vice, DS, Warner, MP, Tyrrell, CL, Rodda, GH and Savidge, J A. 2007. ...

Research paper thumbnail of Application of an Enzyme-linked Immunosorbent Assay for the Analysis of Imidacloprid in Wiliwili Tree, Erythrina sandwicensis O. Deg, for Control of the Wasp Quadrastichus erythrinae

Journal of Agricultural and Food Chemistry, Dec 1, 2006

Research paper thumbnail of Anthurium Thrips Damage to Ornamentals in Hawaii

Research paper thumbnail of Banana Rust Thrips Damage to Banana and Ornamentals in Hawaii

B anana rust thrips, Chaetanaphothrips signipennis (Bagnall) (Thysanoptera: Thripidae), was colle... more B anana rust thrips, Chaetanaphothrips signipennis (Bagnall) (Thysanoptera: Thripidae), was collected once in 1954 from an outdoor planting of anthurium in Manoa, Oahu, and was not seen again until 1996, when it was collected from several commercial nurseries and farms on the island of Hawaii, after causing severe damage to anthurmium, ti, dracaena, and banana. Banana rust thrips are present in parts of Australia

Research paper thumbnail of Banana Rust Thrips Damage to Banana and Ornamentals in Hawaii

Occurrence and control of Chaetanaphothrips signipennis on anthurium, ti, dracaena, and banana ar... more Occurrence and control of Chaetanaphothrips signipennis on anthurium, ti, dracaena, and banana are detailed.

Research paper thumbnail of Root Mealybugs of Quarantine Significance in Hawaii

Three of the seven mealybugs present in Hawaii are of concern to the potted plant for export indu... more Three of the seven mealybugs present in Hawaii are of concern to the potted plant for export industry; control options are discussed.

Research paper thumbnail of Hot water as a potential disinfestation treatment for an invasive anuran amphibian, the coqui frog, Eleutherodactylus coqui Thomas (Leptodactylidae), on potted plants

International Journal of Pest Management, 2010

... DOI: 10.1080/09670870903560114 Arnold H. Hara a * , Christopher M. Jacobsen a , Shenandoah R.... more ... DOI: 10.1080/09670870903560114 Arnold H. Hara a * , Christopher M. Jacobsen a , Shenandoah R. Marr a & Ruth Y. Niino-DuPonte a pages 255-263. ... 20074. Christy, MT, Clark, CS, Gee, DE, Vice, D, Vice, DS, Warner, MP, Tyrrell, CL, Rodda, GH and Savidge, J A. 2007. ...

Research paper thumbnail of Efficacy of systemic insecticides on the gall wasp Quadrastichus erythrinae in wiliwili trees ( Erythrina spp.)

Pest Management Science, 2009

Erythrina gall wasp (EGW), Quadrastichus erythrinae Kim, was first found on Oahu Island, Hawaii, ... more Erythrina gall wasp (EGW), Quadrastichus erythrinae Kim, was first found on Oahu Island, Hawaii, in April 2005. Its rapid spread and infestation in wiliwili trees (Erythrina spp.) have brought an urgent need to suppress its population. Little is known about the control of EGW in wiliwili trees. Among the systemic insecticides abamectin, dinotefuran and imidacloprid, applied via trunk injections or soil drenches, injections of imidacloprid showed better control of EGW in wiliwili trees. All the imidacloprid injection treatments had varying levels of effectiveness against EGW, but not the soil drench. The levels of imidacloprid were higher in lower canopies than those in the other parts within a tree. Imidacloprid remained detectable 1 year after treatment. The trees injected with the products IMA-jet and Merit 200 SL via Arborjet had lower infestation severity ratings for the entire growth season and carried more imidacloprid than those with Imicide via Mauget or Pointer via Wedgle injections. The results indicate that, among the three insecticides tested, imidacloprid is most effective against EGW in the trees. Concentrations of imidacloprid in the leaves need to be 4 mg kg(-1) or higher for good EGW control.

Research paper thumbnail of Population Densities of the Coquí, Eleutherodactylus coqui (Anura: Leptodactylidae) in Newly Invaded Hawaii and in Native Puerto Rico

Journal of Herpetology, 2006

... Herpetologica 34:241-253. WHITFORD, W. G., AND M. E CREUSERE. 1977. ... LAWRENCE L. WOOLBRIGH... more ... Herpetologica 34:241-253. WHITFORD, W. G., AND M. E CREUSERE. 1977. ... LAWRENCE L. WOOLBRIGHT,1 ARNOLD H. HARA,2 CHRISTOPHER M. JACOBSEN,2 WILLIAM J. MAUTZ,3'4 AND FRANCIS L. BENEVIDES JR.2 ...

Research paper thumbnail of Irradiation of <I>Maconellicoccus hirsutus</I> (Homoptera: Pseudococcidae) for Phytosanitation of Agricultural Commodities

Journal of Economic Entomology, 2003

Research paper thumbnail of Hot Water Immersion for Surface Disinfestation of <I>Maconellicoccus hirsutus</I> (Homoptera: Pseudococcidae)

Journal of Economic Entomology, 2005

Mealybug Maconellicoccus hirsutus (Green) adults, nymphs, crawlers, and eggs were tested for thei... more Mealybug Maconellicoccus hirsutus (Green) adults, nymphs, crawlers, and eggs were tested for their susceptibility to hot water immersion at 47, 48, and 49 degrees C. Eggs inside ovisacs were found most tolerant with prolonged survival compared with other stages at all temperatures. Ovisacs required an average of 1.38, 1.46, and 1.62 times longer treatment duration than adults, nymphs, and crawlers, respectively, for 99.9% predicted mortality at 47, 48, and 49 degrees C. Lethal time estimations were calculated from inverse predictions of regressions derived from logit-transformed data as well as those created using a kinetic model. LT 99.9 estimations were 47.0, 21.2, and 11.9 min at 47, 48, and 49 degrees C, respectively, by using regressions with logit transformations. The kinetic model predictions were 43.9, 19.6, and 11.1 min at 47, 48, and 49 degrees C, respectively. During the study no emergence from eggs inside ovisacs was found after treatments of 52, 24, and 14 min at 47, 48, and 49 degrees C, respectively. Results from this study provide efficacious temperature-time treatments.

Research paper thumbnail of Application of an Enzyme-linked Immunosorbent Assay for the Analysis of Imidacloprid in Wiliwili Tree, Erythrina sandwicensis O. Deg, for Control of the Wasp Quadrastichus erythrinae

Journal of Agricultural and Food Chemistry, 2006

Research paper thumbnail of Bait Insecticides and Hot Water Drenches Against the Little Fire Ant, Wasmannia auropunctata (Hymenoptera: Formicidae), Infesting Containerized Nursery Plants

Florida Entomologist, 2011

BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access t... more BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access titles in the biological, ecological, and environmental sciences published by nonprofit societies, associations, museums, institutions, and presses.

Research paper thumbnail of Pest Management Strategies for Anthuriums

No. citrus red mites per leaf UH-CTAHR Pest Management Strategies for Anthuriums IP-17-June 2004 ... more No. citrus red mites per leaf UH-CTAHR Pest Management Strategies for Anthuriums IP-17-June 2004 Efficacy trials Citrus red mite • Avid and Floramite gave good initial and residual control of citrus red mite (CRM) up to 28 days after treatment (DAT) with lower mite counts per leaf than Conserve and untreated controls (Fig. 1).

Research paper thumbnail of Hot water immersion for surface disinfestation of Maconellicoccus hirsutus (Homoptera: Pseudococcidae)

Journal of economic entomology, 2005

Mealybug Maconellicoccus hirsutus (Green) adults, nymphs, crawlers, and eggs were tested for thei... more Mealybug Maconellicoccus hirsutus (Green) adults, nymphs, crawlers, and eggs were tested for their susceptibility to hot water immersion at 47, 48, and 49 degrees C. Eggs inside ovisacs were found most tolerant with prolonged survival compared with other stages at all temperatures. Ovisacs required an average of 1.38, 1.46, and 1.62 times longer treatment duration than adults, nymphs, and crawlers, respectively, for 99.9% predicted mortality at 47, 48, and 49 degrees C. Lethal time estimations were calculated from inverse predictions of regressions derived from logit-transformed data as well as those created using a kinetic model. LT 99.9 estimations were 47.0, 21.2, and 11.9 min at 47, 48, and 49 degrees C, respectively, by using regressions with logit transformations. The kinetic model predictions were 43.9, 19.6, and 11.1 min at 47, 48, and 49 degrees C, respectively. During the study no emergence from eggs inside ovisacs was found after treatments of 52, 24, and 14 min at 47, 48, and 49 degrees C, respectively. Results from this study provide efficacious temperature-time treatments.

Research paper thumbnail of Cycad Scale on Sago Palm

Aulacaspis yasumatsui has spread throughout the Hawaiian Islands since its first occurrence in 19... more Aulacaspis yasumatsui has spread throughout the Hawaiian Islands since its first occurrence in 1998. Cycas revoluta is more susceptible than queen sago (C. rumphii). Strategies that enhance biological control by a tiny black lady beetle, Rhyzobius ...

Research paper thumbnail of Estimating density of calling male Eleutherodactylus coqui in Hawaii from audio recordings of the nighttime frog chorus

Research paper thumbnail of Evaluation of White Peach Scale Control in Papaya with Applaud, 2003

Arthropod Management Tests

Research paper thumbnail of Hot water as a potential disinfestation treatment for an invasive anuran amphibian, the coqui frog, Eleutherodactylus coqui Thomas (Leptodactylidae), on potted plants

International Journal of Pest Management, Jul 1, 2010

... DOI: 10.1080/09670870903560114 Arnold H. Hara a * , Christopher M. Jacobsen a , Shenandoah R.... more ... DOI: 10.1080/09670870903560114 Arnold H. Hara a * , Christopher M. Jacobsen a , Shenandoah R. Marr a &amp; Ruth Y. Niino-DuPonte a pages 255-263. ... 20074. Christy, MT, Clark, CS, Gee, DE, Vice, D, Vice, DS, Warner, MP, Tyrrell, CL, Rodda, GH and Savidge, J A. 2007. ...

Research paper thumbnail of Application of an Enzyme-linked Immunosorbent Assay for the Analysis of Imidacloprid in Wiliwili Tree, Erythrina sandwicensis O. Deg, for Control of the Wasp Quadrastichus erythrinae

Journal of Agricultural and Food Chemistry, Dec 1, 2006

Research paper thumbnail of Anthurium Thrips Damage to Ornamentals in Hawaii

Research paper thumbnail of Banana Rust Thrips Damage to Banana and Ornamentals in Hawaii

B anana rust thrips, Chaetanaphothrips signipennis (Bagnall) (Thysanoptera: Thripidae), was colle... more B anana rust thrips, Chaetanaphothrips signipennis (Bagnall) (Thysanoptera: Thripidae), was collected once in 1954 from an outdoor planting of anthurium in Manoa, Oahu, and was not seen again until 1996, when it was collected from several commercial nurseries and farms on the island of Hawaii, after causing severe damage to anthurmium, ti, dracaena, and banana. Banana rust thrips are present in parts of Australia

Research paper thumbnail of Banana Rust Thrips Damage to Banana and Ornamentals in Hawaii

Occurrence and control of Chaetanaphothrips signipennis on anthurium, ti, dracaena, and banana ar... more Occurrence and control of Chaetanaphothrips signipennis on anthurium, ti, dracaena, and banana are detailed.

Research paper thumbnail of Root Mealybugs of Quarantine Significance in Hawaii

Three of the seven mealybugs present in Hawaii are of concern to the potted plant for export indu... more Three of the seven mealybugs present in Hawaii are of concern to the potted plant for export industry; control options are discussed.

Research paper thumbnail of Hot water as a potential disinfestation treatment for an invasive anuran amphibian, the coqui frog, Eleutherodactylus coqui Thomas (Leptodactylidae), on potted plants

International Journal of Pest Management, 2010

... DOI: 10.1080/09670870903560114 Arnold H. Hara a * , Christopher M. Jacobsen a , Shenandoah R.... more ... DOI: 10.1080/09670870903560114 Arnold H. Hara a * , Christopher M. Jacobsen a , Shenandoah R. Marr a &amp; Ruth Y. Niino-DuPonte a pages 255-263. ... 20074. Christy, MT, Clark, CS, Gee, DE, Vice, D, Vice, DS, Warner, MP, Tyrrell, CL, Rodda, GH and Savidge, J A. 2007. ...

Research paper thumbnail of Efficacy of systemic insecticides on the gall wasp Quadrastichus erythrinae in wiliwili trees ( Erythrina spp.)

Pest Management Science, 2009

Erythrina gall wasp (EGW), Quadrastichus erythrinae Kim, was first found on Oahu Island, Hawaii, ... more Erythrina gall wasp (EGW), Quadrastichus erythrinae Kim, was first found on Oahu Island, Hawaii, in April 2005. Its rapid spread and infestation in wiliwili trees (Erythrina spp.) have brought an urgent need to suppress its population. Little is known about the control of EGW in wiliwili trees. Among the systemic insecticides abamectin, dinotefuran and imidacloprid, applied via trunk injections or soil drenches, injections of imidacloprid showed better control of EGW in wiliwili trees. All the imidacloprid injection treatments had varying levels of effectiveness against EGW, but not the soil drench. The levels of imidacloprid were higher in lower canopies than those in the other parts within a tree. Imidacloprid remained detectable 1 year after treatment. The trees injected with the products IMA-jet and Merit 200 SL via Arborjet had lower infestation severity ratings for the entire growth season and carried more imidacloprid than those with Imicide via Mauget or Pointer via Wedgle injections. The results indicate that, among the three insecticides tested, imidacloprid is most effective against EGW in the trees. Concentrations of imidacloprid in the leaves need to be 4 mg kg(-1) or higher for good EGW control.

Research paper thumbnail of Population Densities of the Coquí, Eleutherodactylus coqui (Anura: Leptodactylidae) in Newly Invaded Hawaii and in Native Puerto Rico

Journal of Herpetology, 2006

... Herpetologica 34:241-253. WHITFORD, W. G., AND M. E CREUSERE. 1977. ... LAWRENCE L. WOOLBRIGH... more ... Herpetologica 34:241-253. WHITFORD, W. G., AND M. E CREUSERE. 1977. ... LAWRENCE L. WOOLBRIGHT,1 ARNOLD H. HARA,2 CHRISTOPHER M. JACOBSEN,2 WILLIAM J. MAUTZ,3&amp;#x27;4 AND FRANCIS L. BENEVIDES JR.2 ...

Research paper thumbnail of Irradiation of <I>Maconellicoccus hirsutus</I> (Homoptera: Pseudococcidae) for Phytosanitation of Agricultural Commodities

Journal of Economic Entomology, 2003

Research paper thumbnail of Hot Water Immersion for Surface Disinfestation of <I>Maconellicoccus hirsutus</I> (Homoptera: Pseudococcidae)

Journal of Economic Entomology, 2005

Mealybug Maconellicoccus hirsutus (Green) adults, nymphs, crawlers, and eggs were tested for thei... more Mealybug Maconellicoccus hirsutus (Green) adults, nymphs, crawlers, and eggs were tested for their susceptibility to hot water immersion at 47, 48, and 49 degrees C. Eggs inside ovisacs were found most tolerant with prolonged survival compared with other stages at all temperatures. Ovisacs required an average of 1.38, 1.46, and 1.62 times longer treatment duration than adults, nymphs, and crawlers, respectively, for 99.9% predicted mortality at 47, 48, and 49 degrees C. Lethal time estimations were calculated from inverse predictions of regressions derived from logit-transformed data as well as those created using a kinetic model. LT 99.9 estimations were 47.0, 21.2, and 11.9 min at 47, 48, and 49 degrees C, respectively, by using regressions with logit transformations. The kinetic model predictions were 43.9, 19.6, and 11.1 min at 47, 48, and 49 degrees C, respectively. During the study no emergence from eggs inside ovisacs was found after treatments of 52, 24, and 14 min at 47, 48, and 49 degrees C, respectively. Results from this study provide efficacious temperature-time treatments.

Research paper thumbnail of Application of an Enzyme-linked Immunosorbent Assay for the Analysis of Imidacloprid in Wiliwili Tree, Erythrina sandwicensis O. Deg, for Control of the Wasp Quadrastichus erythrinae

Journal of Agricultural and Food Chemistry, 2006

Research paper thumbnail of Bait Insecticides and Hot Water Drenches Against the Little Fire Ant, Wasmannia auropunctata (Hymenoptera: Formicidae), Infesting Containerized Nursery Plants

Florida Entomologist, 2011

BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access t... more BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access titles in the biological, ecological, and environmental sciences published by nonprofit societies, associations, museums, institutions, and presses.

Research paper thumbnail of Pest Management Strategies for Anthuriums

No. citrus red mites per leaf UH-CTAHR Pest Management Strategies for Anthuriums IP-17-June 2004 ... more No. citrus red mites per leaf UH-CTAHR Pest Management Strategies for Anthuriums IP-17-June 2004 Efficacy trials Citrus red mite • Avid and Floramite gave good initial and residual control of citrus red mite (CRM) up to 28 days after treatment (DAT) with lower mite counts per leaf than Conserve and untreated controls (Fig. 1).

Research paper thumbnail of Hot water immersion for surface disinfestation of Maconellicoccus hirsutus (Homoptera: Pseudococcidae)

Journal of economic entomology, 2005

Mealybug Maconellicoccus hirsutus (Green) adults, nymphs, crawlers, and eggs were tested for thei... more Mealybug Maconellicoccus hirsutus (Green) adults, nymphs, crawlers, and eggs were tested for their susceptibility to hot water immersion at 47, 48, and 49 degrees C. Eggs inside ovisacs were found most tolerant with prolonged survival compared with other stages at all temperatures. Ovisacs required an average of 1.38, 1.46, and 1.62 times longer treatment duration than adults, nymphs, and crawlers, respectively, for 99.9% predicted mortality at 47, 48, and 49 degrees C. Lethal time estimations were calculated from inverse predictions of regressions derived from logit-transformed data as well as those created using a kinetic model. LT 99.9 estimations were 47.0, 21.2, and 11.9 min at 47, 48, and 49 degrees C, respectively, by using regressions with logit transformations. The kinetic model predictions were 43.9, 19.6, and 11.1 min at 47, 48, and 49 degrees C, respectively. During the study no emergence from eggs inside ovisacs was found after treatments of 52, 24, and 14 min at 47, 48, and 49 degrees C, respectively. Results from this study provide efficacious temperature-time treatments.

Research paper thumbnail of Cycad Scale on Sago Palm

Aulacaspis yasumatsui has spread throughout the Hawaiian Islands since its first occurrence in 19... more Aulacaspis yasumatsui has spread throughout the Hawaiian Islands since its first occurrence in 1998. Cycas revoluta is more susceptible than queen sago (C. rumphii). Strategies that enhance biological control by a tiny black lady beetle, Rhyzobius ...