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Catalogue: Broadacre Field Crops DAFF QLD
Ascovirus-infected larvae are small, pale and can look as though they have been grazing in one place, leaving small 'windows' in the leaf State of Queensland.. Some predators found commonly in crops will not feed on helicoverpa at all and some may only feed on certain stages (for example, larvae of a particular size, or only eggs)... Natural enemies will rarely eradicate all eggs or larvae, but may reduce infestations to below economic threshold if predators and parasitoids are not disrupted by broad-spectrum insecticides...
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Catalogue: Broadacre Field Crops DAFF QLD
Ascovirus-infected larvae are small, pale and can look as though they have been grazing in one place, leaving small 'windows' in the leaf State of Queensland.. Some predators found commonly in crops will not feed on helicoverpa at all and some may only feed on certain stages (for example, larvae of a particular size, or only eggs)... Natural enemies will rarely eradicate all eggs or larvae, but may reduce infestations to below economic threshold if predators and parasitoids are not disrupted by broad-spectrum insecticides...
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Catalogue: Broadacre Field Crops DAFF QLD
The best approach to managing helicoverpa is to use a combination of both chemical and non-chemical tools... By considering the ecology of H. armigera and H. punctigera , several key principles emerge that will assist in the successful and sustainable management of these pests... Insect-resistant genetically modified (GM) cotton has been developed to produce a highly specific toxin that kills helicoverpa larvae that feed on the cotton plant...
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Catalogue: Broadacre Field Crops DAFF QLD
The best approach to managing helicoverpa is to use a combination of both chemical and non-chemical tools... By considering the ecology of H. armigera and H. punctigera , several key principles emerge that will assist in the successful and sustainable management of these pests... Insect-resistant genetically modified (GM) cotton has been developed to produce a highly specific toxin that kills helicoverpa larvae that feed on the cotton plant...
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Catalogue: Broadacre Field Crops DAFF QLD
The best approach to managing helicoverpa is to use a combination of both chemical and non-chemical tools... By considering the ecology of H. armigera and H. punctigera , several key principles emerge that will assist in the successful and sustainable management of these pests... Insect-resistant genetically modified (GM) cotton has been developed to produce a highly specific toxin that kills helicoverpa larvae that feed on the cotton plant...
Related categories:
Catalogue: Broadacre Field Crops DAFF QLD
" Print the page Illustration showing the life cycle of Microplitis demolitor... To determine whether Microplitis is active and present in significant numbers: look for adult wasps #ying above the crop or use a sweep net to check in the crop collect caterpillars shorter that 15 mm and perform the split test on a number to estimate percentage parasitism look for visible signs of parasitoid activity, that is, the distinctive fawn cocoons (often next to a dead or dying caterpillar) and/or small pale caterpillars that might be infected with ascovirus (see Ascovirus symptoms ) crop scouting data can also be an important trigger to check for Microplitis ... Microplitis activity should be suspected in situations when previous counts have shown the presence of eggs and very small caterpillars, but these do not seem to be developing through to third instar caterpillars and larger (that is, longer than 15 mm)...
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Catalogue: Broadacre Field Crops DAFF QLD
" Print the page Illustration showing the life cycle of Microplitis demolitor... To determine whether Microplitis is active and present in significant numbers: look for adult wasps #ying above the crop or use a sweep net to check in the crop collect caterpillars shorter that 15 mm and perform the split test on a number to estimate percentage parasitism look for visible signs of parasitoid activity, that is, the distinctive fawn cocoons (often next to a dead or dying caterpillar) and/or small pale caterpillars that might be infected with ascovirus (see Ascovirus symptoms ) crop scouting data can also be an important trigger to check for Microplitis ... Microplitis activity should be suspected in situations when previous counts have shown the presence of eggs and very small caterpillars, but these do not seem to be developing through to third instar caterpillars and larger (that is, longer than 15 mm)...
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Catalogue: Broadacre Field Crops DAFF QLD
" Print the page Illustration showing the life cycle of Microplitis demolitor... To determine whether Microplitis is active and present in significant numbers: look for adult wasps #ying above the crop or use a sweep net to check in the crop collect caterpillars shorter that 15 mm and perform the split test on a number to estimate percentage parasitism look for visible signs of parasitoid activity, that is, the distinctive fawn cocoons (often next to a dead or dying caterpillar) and/or small pale caterpillars that might be infected with ascovirus (see Ascovirus symptoms ) crop scouting data can also be an important trigger to check for Microplitis ... Microplitis activity should be suspected in situations when previous counts have shown the presence of eggs and very small caterpillars, but these do not seem to be developing through to third instar caterpillars and larger (that is, longer than 15 mm)...
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Catalogue: Broadacre Field Crops DAFF QLD
Close up photograph of an adult Brown shield bug resting on plant material - image copyright J. Wessels.. Action level: Populations of podsucking bugs other than GVB are converted to GVB equivalents, and decisions made based on the GVB thresholds... Conservation of natural enemies: Spiders, ants, and predatory bugs are major predators of BSB, particularly of eggs and young nymphs with mortality of these stages sometimes exceeding 90%...
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Catalogue: Broadacre Field Crops DAFF QLD
Close up photograph of an adult Brown shield bug resting on plant material - image copyright J. Wessels.. Action level: Populations of podsucking bugs other than GVB are converted to GVB equivalents, and decisions made based on the GVB thresholds... Conservation of natural enemies: Spiders, ants, and predatory bugs are major predators of BSB, particularly of eggs and young nymphs with mortality of these stages sometimes exceeding 90%...
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