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parasitism

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...
Related categories:
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
As a general rule, Microplitis has greater impact on near-threshold Helicoverpa populations than against populations in excess of the economic spray threshold for that crop... Microplitis is active in all crops attacked by Helicoverpa , except chickpea because the plant s acid secretions deter predators and parasitoids... In early spring, even low numbers of Microplitis can parasitise a significant proportion of the Helicoverpa population because the Helicoverpa numbers are also low (e.g. in spring mungbeans, sun#owers and sorghum)...
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Catalogue: Broadacre Field Crops DAFF QLD
As a general rule, Microplitis has greater impact on near-threshold Helicoverpa populations than against populations in excess of the economic spray threshold for that crop... Microplitis is active in all crops attacked by Helicoverpa , except chickpea because the plant s acid secretions deter predators and parasitoids... In early spring, even low numbers of Microplitis can parasitise a significant proportion of the Helicoverpa population because the Helicoverpa numbers are also low (e.g. in spring mungbeans, sun#owers and sorghum)...
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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)...
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)...
Related categories: