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helicoverpa larva

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: GRDC Updates (North)
Until such varieties are released, northern growers and advisers need to select varieties firstly on the basis of crown rot risk and then manage for stripe rust ... There is a risk of WSMV being spread through infected seed into new areas... We have not been able to determine an economic threshold for RGB in sorghum from these trials...
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Catalogue: GRDC Updates (South)
Until such varieties are released, northern growers and advisers need to select varieties firstly on the basis of crown rot risk and then manage for stripe rust ... There is a risk of WSMV being spread through infected seed into new areas... We have not been able to determine an economic threshold for RGB in sorghum from these trials...
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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...
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Catalogue: Ground Cover
Beat sheet and sweep net sampling of faba beans both severely underestimate the density of helicoverpa larvae, particularly smaller ones; a visual inspection is critical to improving pest number estimates.. Populations may be exceeding threshold before this is detected," Dr Miles says... Insect damage is not responsible for the majority of defective grain but further analysis is warranted to consider how the pod damage caused by helicoverpa may be contributing to weathering and poor colour in faba beans by allowing entry of fungi and bacteria...
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Catalogue: Ground Cover
Beat sheet and sweep net sampling of faba beans both severely underestimate the density of helicoverpa larvae, particularly smaller ones; a visual inspection is critical to improving pest number estimates.. Populations may be exceeding threshold before this is detected," Dr Miles says... Insect damage is not responsible for the majority of defective grain but further analysis is warranted to consider how the pod damage caused by helicoverpa may be contributing to weathering and poor colour in faba beans by allowing entry of fungi and bacteria...
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Catalogue: Broadacre Field Crops DAFF QLD
Normal helicoverpa egg on left, black parasitised egg on right.. H. armigera has developed resistance to a wide range of insecticides a number of products are now registered for both species that have reduced impacts on natural enemies in the crop... All stages of the helicoverpa lifecycle are attacked by a wide range of predators, parasitoids and pathgens, and conserving these in the crop through the avoidance of broad-spectrum insecticides can help prevent/minimise the need for insecticide treatments...
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