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helicoverpa

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Catalogue: Broadacre Field Crops DAFF QLD
Microplitis is the main vector of ascovirus and so plays a key role in increasing the percentage of caterpillars affected by this disease... High levels of ascovirus may lead to a decline in Microplitis wasp populations... small pale caterpillars in unusually exposed situations (e.g. on a leaf) that look as though they have been feeding in the same place for some time, making a window in the leaf, are probably infected with ascovirus because infected caterpillars can take a long time to die, ascovirus infection in the population can show up in crop scouting data over a series of checks as a number of small caterpillars (shorter than 8 mm) in the crop, with very few medium-large caterpillars coming through...
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Catalogue: Broadacre Field Crops DAFF QLD
Microplitis is the main vector of ascovirus and so plays a key role in increasing the percentage of caterpillars affected by this disease... High levels of ascovirus may lead to a decline in Microplitis wasp populations... small pale caterpillars in unusually exposed situations (e.g. on a leaf) that look as though they have been feeding in the same place for some time, making a window in the leaf, are probably infected with ascovirus because infected caterpillars can take a long time to die, ascovirus infection in the population can show up in crop scouting data over a series of checks as a number of small caterpillars (shorter than 8 mm) in the crop, with very few medium-large caterpillars coming through...
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Catalogue: Broadacre Field Crops DAFF QLD
Microplitis is the main vector of ascovirus and so plays a key role in increasing the percentage of caterpillars affected by this disease... High levels of ascovirus may lead to a decline in Microplitis wasp populations... small pale caterpillars in unusually exposed situations (e.g. on a leaf) that look as though they have been feeding in the same place for some time, making a window in the leaf, are probably infected with ascovirus because infected caterpillars can take a long time to die, ascovirus infection in the population can show up in crop scouting data over a series of checks as a number of small caterpillars (shorter than 8 mm) in the crop, with very few medium-large caterpillars coming through...
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Catalogue: Broadacre Field Crops DAFF QLD
Insect-resistant cotton is often called 'Bt cotton'... The Australian cotton industry was well aware that the adoption of Helicoverpa -resistant varieties that would be expressing the Bt toxin throughout the length of the cotton season posed a considerable resistance risk... A comprehensive resistance management package has been negotiated between industry, regulators and the owners of the GM technology to ensure that growing practices have been adopted to protect the longevity of the Bt toxins used in the current GM cotton varieties...
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Catalogue: Broadacre Field Crops DAFF QLD
Insect-resistant cotton is often called 'Bt cotton'... The Australian cotton industry was well aware that the adoption of Helicoverpa -resistant varieties that would be expressing the Bt toxin throughout the length of the cotton season posed a considerable resistance risk... A comprehensive resistance management package has been negotiated between industry, regulators and the owners of the GM technology to ensure that growing practices have been adopted to protect the longevity of the Bt toxins used in the current GM cotton varieties...
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Catalogue: Broadacre Field Crops DAFF QLD
Insect-resistant cotton is often called 'Bt cotton'... The Australian cotton industry was well aware that the adoption of Helicoverpa -resistant varieties that would be expressing the Bt toxin throughout the length of the cotton season posed a considerable resistance risk... A comprehensive resistance management package has been negotiated between industry, regulators and the owners of the GM technology to ensure that growing practices have been adopted to protect the longevity of the Bt toxins used in the current GM cotton varieties...
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Catalogue: Broadacre Field Crops DAFF QLD
Image of a Microplitis demolitor wasp stinging a helicoverpa larva.. Microplitis adult aproaching a helicoverpa larva... Look for them flying above the crop or use a sweep net to sample the crop collect caterpillars shorter that 15 mm and perform the split test to estimate percent parasitism (number parasitised total larvae split x 100) look for visible signs of parasitoid activity, e.g. the distinctive fawn cocoons and/or small pale caterpillars that might be infected with ascovirus cross-check crop scouting data - if eggs and very small caterpillars do not seem to be developing through to larger caterpillars (>15 mm), this may be due to Microplitis activity...
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Catalogue: Broadacre Field Crops DAFF QLD
Image of a Microplitis demolitor wasp stinging a helicoverpa larva.. Microplitis adult aproaching a helicoverpa larva... Look for them flying above the crop or use a sweep net to sample the crop collect caterpillars shorter that 15 mm and perform the split test to estimate percent parasitism (number parasitised total larvae split x 100) look for visible signs of parasitoid activity, e.g. the distinctive fawn cocoons and/or small pale caterpillars that might be infected with ascovirus cross-check crop scouting data - if eggs and very small caterpillars do not seem to be developing through to larger caterpillars (>15 mm), this may be due to Microplitis activity...
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Catalogue: Broadacre Field Crops DAFF QLD
Image of a Microplitis demolitor wasp stinging a helicoverpa larva.. Microplitis adult aproaching a helicoverpa larva... Look for them flying above the crop or use a sweep net to sample the crop collect caterpillars shorter that 15 mm and perform the split test to estimate percent parasitism (number parasitised total larvae split x 100) look for visible signs of parasitoid activity, e.g. the distinctive fawn cocoons and/or small pale caterpillars that might be infected with ascovirus cross-check crop scouting data - if eggs and very small caterpillars do not seem to be developing through to larger caterpillars (>15 mm), this may be due to Microplitis activity...
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Catalogue: Broadacre Field Crops DAFF QLD
Loopers can be distinguished from helicoverpa by: their 'looping' action when walking by their body, which tapers to the head they have only two pairs of hind legs, as opposed to four for helicoverpa... Loopers appear susceptible to all insecticides used for helicoverpa control, with the exception of Gemstar and Vivus (NPVs) which only act against helicoverpa... Dipel (Bt) is far more effective against loopers than against helicoverpa but thorough coverage is required for best results...
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