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Catalogue: Broadacre Field Crops DAFF QLD
Photograph of Cotton aphids showing variations in colour - some yellow and some black.. A wide range of aphid species can affect field crops... Often occurring in colonies, aphids suck on sap, causing loss of vigour, and in some cases yellowing, stunting or distortion of plant parts...
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Catalogue: Broadacre Field Crops DAFF QLD
Photograph of Cotton aphids showing variations in colour - some yellow and some black.. A wide range of aphid species can affect field crops... Often occurring in colonies, aphids suck on sap, causing loss of vigour, and in some cases yellowing, stunting or distortion of plant parts...
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Catalogue: Broadacre Field Crops DAFF QLD
Photograph of Cotton aphids showing variations in colour - some yellow and some black.. A wide range of aphid species can affect field crops... Often occurring in colonies, aphids suck on sap, causing loss of vigour, and in some cases yellowing, stunting or distortion of plant parts...
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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
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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