Gordon Port - Academia.edu (original) (raw)

Papers by Gordon Port

Research paper thumbnail of Efficacy of a Beauveria bassiana strain, Bacillus thuringiensis and their combination against the tomato leafminer Tuta absoluta

ENTOMOLOGIA HELLENICA

A single leaf bioassay was developed to investigate the entomopathogenic efficacy of a Beauveria ... more A single leaf bioassay was developed to investigate the entomopathogenic efficacy of a Beauveria bassiana strain, Bacillus thuringiensis (Costar®) and their interactions on larval mortality of Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae). Tomato leaves were removed from the plants and sprayed with manufacturers’ highest field recommended concentrations for tomato crops before or after infesting the leaves with the larvae. Third instar larvae proved the most susceptible, while susceptibility was lower in the second instar larvae. The combined use showed a higher potential indicating a positive synergistic effect. In addition, treated leaves were sprayed directly with concentrations of 0.0, 0.05, 0.10, 0.15 and 0.20 mL/L of B. bassiana. The efficacy was higher for the tested concentration of 0.20 mL/L that is higher than the recommended dose. The present study suggests that those bioinsecticides have a good potential in the control of T. absoluta.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Not All Slugs Are the Same: Variation in Growth and Development of the Slug Deroceras reticulatum

Insects

Models to forecast slug populations make assumptions about growth and mortality in response to en... more Models to forecast slug populations make assumptions about growth and mortality in response to environmental factors. To refine these models, the growth trajectories and survival of Deroceras reticulatum, a worldwide pest, hatching in spring and autumn were compared at three rearing temperatures (ambient, 12 °C and 15 °C). Deroceras reticulatum reared under identical conditions showed great variation in growth and strong bimodality in growth rates. At all rearing temperatures, growth was influenced by hatching season; in all cases, fast growers dominated in autumn and slow growers dominated in spring. Survival was influenced by hatching season: autumn-born slugs survived better at ambient temperatures, but spring-born slugs had better survival at 15 °C. Deroceras reticulatum may be partitioned into ”slow growers” and ”fast growers”. Fast growers responded to warmer conditions, growing to large sizes. Slow growers, in contrast, gained weight at comparable rates to ambient reared slug...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Bemisia tabaci in Iraq: Population structure, endosymbiont diversity and putative species

Journal of Applied Entomology

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Living on the Edge: Using and Improving Trap Crops for Flea Beetle Management in Small-Scale Cropping Systems

Insects

The use of trap crops to manage pest insects offers an attractive alternative to synthetic pestic... more The use of trap crops to manage pest insects offers an attractive alternative to synthetic pesticides. Trap crops may work particularly well at smaller production scales, being highly amenable where crop diversification and reduction of synthetic inputs are prioritised over yield alone. This paper describes a series of experiments. The first was to demonstrate the potential of turnip rape (Brassica rapa L., var. Pasja) as a trap crop to arrest flea beetles (Phyllotreta spp.) to protect a main crop of cauliflower (Brassica oleracea L., var. Lateman). The subsequent experiments explored two possible approaches to improve the function of the trap crop—either by separating trap and main crop plants spatially, or by introducing companion plants of tomato (Lycopersicon esculentum Mill., cv Amateur) into the main crop. In caged field experiments, feeding damage by flea beetles to crop border plantings of turnip rape far exceeded damage to cauliflower plants placed in the same position, ind...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Population structure of the glasshouse whitefly Trialeurodes vaporariorum (Hemiptera: Aleyrodidae) shows multiple introductions to the U.K

Agricultural and Forest Entomology

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The Biology of Lymnaea peregra (Muller) (Gastropoda:Pulmonata: Basommatophora) with Special Reference to the Effects of Herbicides on its Reproduction

Journal of Biological Sciences

ABSTRACT

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Effects of roadside conditions on plants and insects. I: Atmospheric conditions

Journal of Applied Ecology, 1988

... (4) NO,, absorbed by roadside soil, was probably the cause of these effects. The effects may ... more ... (4) NO,, absorbed by roadside soil, was probably the cause of these effects. The effects may also have been related to the greater de-icing salt concentration in roadside soil. ... Davison, AW (1971). The effects of de-icing salt on roadside verges. I. Soil and plant analysis. ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The influence of soil moisture content on the activity of Deroceras reticulatum (M�ller)

J Mollus Stud, 1991

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Influence of food and temperature on growth performance and maturation of Lymnaea peregra (Muller) (Gastropoda: Pulmonata: Lymnaeidae) under laboratory conditions

University Journal of Zoology Rajshahi University, 2007

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Structure based interference with insect behaviour - cyclopropene analogues of pheromones containing Z-alkenes

Tetrahedron, 1996

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Dead-end trap cropping

Iobc Wprs Bulletin, 2009

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Method and Means for Controlling Insect Species

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Selection of trap crop and companion plants for the management of pest insects in field vegetables

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Biological control of tomato leaf miner Tuta absoluta using entomopathogenic nematodes

ABSTRACT

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Reaktion von Tribolium castaneum Larven auf synthetisches Aggregationspheromon

Entomologia Experimentalis Et Applicata, 1984

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Influence of food and temperature on growth performance and maturation of <i>Lymnaea peregra</i> (Muller) (Gastropoda: Pulmonata: Lymnaeidae) under laboratory conditions

University Journal of Zoology, Rajshahi University, 2007

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Success in Biological Control of Terrestrial Molluscs

Biological Control: Measures of Success, 2000

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Interactions between seedling herbivory and life history traits affecting restoration of species-rich grasslands

Background/Question/Methods Species rich upland hay meadows are of high biodiversity importance a... more Background/Question/Methods Species rich upland hay meadows are of high biodiversity importance and are internationally rare. In recent decades there has been growing interest in restoring botanical diversity of agriculturally improved sites, but little is known about the effects of invertebrate herbivores. Previous research involving restoration of upland meadows has identified the optimum farm management regime, and the need to add seed of species absent from the seed bank of improved sites which are drivers of above- and below-ground community-level properties, including the hemi-parasite Rhinanthus minor and a variety of early-colonising fungal-facilitating species. In view of the possible selective pressure slugs exert on seedling recruitment in the field and the lack of knowledge in this context at grassland restoration sites, the acceptability of seedlings of meadow plants to the generalist slug, Deroceras reticulatum were determined in controlled microcosms. Slugs were offer...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Carabid Beetles recorded feeding on slugs in arable fields using ELISA

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Behaviour of the adult seven spot ladybird, Coccinella septempunctata (Coleoptera: Coccinellidae), in response to dimethoate residue on bean plants in the laboratory

Bulletin of entomological research, 2001

The sub-lethal effects of dimethoate residue on the distribution and locomotor activity of adults... more The sub-lethal effects of dimethoate residue on the distribution and locomotor activity of adults of Coccinella septempunctata Linnaeus on Vicia faba plants were investigated in the laboratory. The presence of dimethoate residues on the upper half of the plant caused C. septempunctata to spend significantly less time on the plants overall. When given a choice of treated and untreated surfaces, C. septempunctata spent proportionately more time on the untreated areas of the plant. The locomotor activity of C. septempunctata was also altered following encounter with dimethoate residues resulting in a significant increase in the proportion of time spent walking and a reduction in the proportion of time spent resting. The proportion of time spent on plant parts was also affected, with a reduction in the time spent on the apex and an increase in the proportion of time spent on the stem, indicating a possible avoidance response. The proportion of time spent on the adaxial leaf surface was ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Efficacy of a Beauveria bassiana strain, Bacillus thuringiensis and their combination against the tomato leafminer Tuta absoluta

ENTOMOLOGIA HELLENICA

A single leaf bioassay was developed to investigate the entomopathogenic efficacy of a Beauveria ... more A single leaf bioassay was developed to investigate the entomopathogenic efficacy of a Beauveria bassiana strain, Bacillus thuringiensis (Costar®) and their interactions on larval mortality of Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae). Tomato leaves were removed from the plants and sprayed with manufacturers’ highest field recommended concentrations for tomato crops before or after infesting the leaves with the larvae. Third instar larvae proved the most susceptible, while susceptibility was lower in the second instar larvae. The combined use showed a higher potential indicating a positive synergistic effect. In addition, treated leaves were sprayed directly with concentrations of 0.0, 0.05, 0.10, 0.15 and 0.20 mL/L of B. bassiana. The efficacy was higher for the tested concentration of 0.20 mL/L that is higher than the recommended dose. The present study suggests that those bioinsecticides have a good potential in the control of T. absoluta.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Not All Slugs Are the Same: Variation in Growth and Development of the Slug Deroceras reticulatum

Insects

Models to forecast slug populations make assumptions about growth and mortality in response to en... more Models to forecast slug populations make assumptions about growth and mortality in response to environmental factors. To refine these models, the growth trajectories and survival of Deroceras reticulatum, a worldwide pest, hatching in spring and autumn were compared at three rearing temperatures (ambient, 12 °C and 15 °C). Deroceras reticulatum reared under identical conditions showed great variation in growth and strong bimodality in growth rates. At all rearing temperatures, growth was influenced by hatching season; in all cases, fast growers dominated in autumn and slow growers dominated in spring. Survival was influenced by hatching season: autumn-born slugs survived better at ambient temperatures, but spring-born slugs had better survival at 15 °C. Deroceras reticulatum may be partitioned into ”slow growers” and ”fast growers”. Fast growers responded to warmer conditions, growing to large sizes. Slow growers, in contrast, gained weight at comparable rates to ambient reared slug...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Bemisia tabaci in Iraq: Population structure, endosymbiont diversity and putative species

Journal of Applied Entomology

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Living on the Edge: Using and Improving Trap Crops for Flea Beetle Management in Small-Scale Cropping Systems

Insects

The use of trap crops to manage pest insects offers an attractive alternative to synthetic pestic... more The use of trap crops to manage pest insects offers an attractive alternative to synthetic pesticides. Trap crops may work particularly well at smaller production scales, being highly amenable where crop diversification and reduction of synthetic inputs are prioritised over yield alone. This paper describes a series of experiments. The first was to demonstrate the potential of turnip rape (Brassica rapa L., var. Pasja) as a trap crop to arrest flea beetles (Phyllotreta spp.) to protect a main crop of cauliflower (Brassica oleracea L., var. Lateman). The subsequent experiments explored two possible approaches to improve the function of the trap crop—either by separating trap and main crop plants spatially, or by introducing companion plants of tomato (Lycopersicon esculentum Mill., cv Amateur) into the main crop. In caged field experiments, feeding damage by flea beetles to crop border plantings of turnip rape far exceeded damage to cauliflower plants placed in the same position, ind...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Population structure of the glasshouse whitefly Trialeurodes vaporariorum (Hemiptera: Aleyrodidae) shows multiple introductions to the U.K

Agricultural and Forest Entomology

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The Biology of Lymnaea peregra (Muller) (Gastropoda:Pulmonata: Basommatophora) with Special Reference to the Effects of Herbicides on its Reproduction

Journal of Biological Sciences

ABSTRACT

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Effects of roadside conditions on plants and insects. I: Atmospheric conditions

Journal of Applied Ecology, 1988

... (4) NO,, absorbed by roadside soil, was probably the cause of these effects. The effects may ... more ... (4) NO,, absorbed by roadside soil, was probably the cause of these effects. The effects may also have been related to the greater de-icing salt concentration in roadside soil. ... Davison, AW (1971). The effects of de-icing salt on roadside verges. I. Soil and plant analysis. ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The influence of soil moisture content on the activity of Deroceras reticulatum (M�ller)

J Mollus Stud, 1991

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Influence of food and temperature on growth performance and maturation of Lymnaea peregra (Muller) (Gastropoda: Pulmonata: Lymnaeidae) under laboratory conditions

University Journal of Zoology Rajshahi University, 2007

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Structure based interference with insect behaviour - cyclopropene analogues of pheromones containing Z-alkenes

Tetrahedron, 1996

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Dead-end trap cropping

Iobc Wprs Bulletin, 2009

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Method and Means for Controlling Insect Species

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Selection of trap crop and companion plants for the management of pest insects in field vegetables

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Biological control of tomato leaf miner Tuta absoluta using entomopathogenic nematodes

ABSTRACT

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Reaktion von Tribolium castaneum Larven auf synthetisches Aggregationspheromon

Entomologia Experimentalis Et Applicata, 1984

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Influence of food and temperature on growth performance and maturation of <i>Lymnaea peregra</i> (Muller) (Gastropoda: Pulmonata: Lymnaeidae) under laboratory conditions

University Journal of Zoology, Rajshahi University, 2007

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Success in Biological Control of Terrestrial Molluscs

Biological Control: Measures of Success, 2000

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Interactions between seedling herbivory and life history traits affecting restoration of species-rich grasslands

Background/Question/Methods Species rich upland hay meadows are of high biodiversity importance a... more Background/Question/Methods Species rich upland hay meadows are of high biodiversity importance and are internationally rare. In recent decades there has been growing interest in restoring botanical diversity of agriculturally improved sites, but little is known about the effects of invertebrate herbivores. Previous research involving restoration of upland meadows has identified the optimum farm management regime, and the need to add seed of species absent from the seed bank of improved sites which are drivers of above- and below-ground community-level properties, including the hemi-parasite Rhinanthus minor and a variety of early-colonising fungal-facilitating species. In view of the possible selective pressure slugs exert on seedling recruitment in the field and the lack of knowledge in this context at grassland restoration sites, the acceptability of seedlings of meadow plants to the generalist slug, Deroceras reticulatum were determined in controlled microcosms. Slugs were offer...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Carabid Beetles recorded feeding on slugs in arable fields using ELISA

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Behaviour of the adult seven spot ladybird, Coccinella septempunctata (Coleoptera: Coccinellidae), in response to dimethoate residue on bean plants in the laboratory

Bulletin of entomological research, 2001

The sub-lethal effects of dimethoate residue on the distribution and locomotor activity of adults... more The sub-lethal effects of dimethoate residue on the distribution and locomotor activity of adults of Coccinella septempunctata Linnaeus on Vicia faba plants were investigated in the laboratory. The presence of dimethoate residues on the upper half of the plant caused C. septempunctata to spend significantly less time on the plants overall. When given a choice of treated and untreated surfaces, C. septempunctata spent proportionately more time on the untreated areas of the plant. The locomotor activity of C. septempunctata was also altered following encounter with dimethoate residues resulting in a significant increase in the proportion of time spent walking and a reduction in the proportion of time spent resting. The proportion of time spent on plant parts was also affected, with a reduction in the time spent on the apex and an increase in the proportion of time spent on the stem, indicating a possible avoidance response. The proportion of time spent on the adaxial leaf surface was ...

Bookmarks Related papers MentionsView impact