Gordon Port - Academia.edu (original) (raw)
Papers by Gordon Port
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.
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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...
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Journal of Applied Entomology
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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...
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Agricultural and Forest Entomology
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Journal of Biological Sciences
ABSTRACT
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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. ...
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J Mollus Stud, 1991
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University Journal of Zoology Rajshahi University, 2007
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Tetrahedron, 1996
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Iobc Wprs Bulletin, 2009
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ABSTRACT
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Entomologia Experimentalis Et Applicata, 1984
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University Journal of Zoology, Rajshahi University, 2007
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Biological Control: Measures of Success, 2000
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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...
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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 ...
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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
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...
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Journal of Applied Entomology
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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...
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Agricultural and Forest Entomology
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Journal of Biological Sciences
ABSTRACT
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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. ...
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J Mollus Stud, 1991
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University Journal of Zoology Rajshahi University, 2007
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Tetrahedron, 1996
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Iobc Wprs Bulletin, 2009
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
ABSTRACT
Bookmarks Related papers MentionsView impact
Entomologia Experimentalis Et Applicata, 1984
Bookmarks Related papers MentionsView impact
University Journal of Zoology, Rajshahi University, 2007
Bookmarks Related papers MentionsView impact
Biological Control: Measures of Success, 2000
Bookmarks Related papers MentionsView impact
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
Bookmarks Related papers MentionsView impact
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