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Catalogue: GRDC Media
Act early to reduce canola virus risk this coming season.. Entomologist Paul Umina of cesar says widespread infestations of green peach aphid (GPA) contributed to the 2014 outbreak of BWYV, which is transferred into canola crops by aphids carrying the virus... SARDI plant pathologist Jenny Davidson said this funding was and will be used in a number of areas, including forensic analysis of canola paddocks; communication to growers and advisers (assisted in SA with an additional $40,000 in emergency funding provided by SAGIT); and preliminary assessment of virus levels in different canola varieties to identify if there are any useful levels of resistance to BWYV for future sowing recommendations...
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Catalogue: GRDC Media
Crop insect pest and disease experts, supported by the Grains Research and Development Corporation (GRDC), advise that strategies put in place now will help to discourage aphid population build-up and the potential for crop diseases, especially beet western yellows virus (BWYV), during the growing season... Entomologist Paul Umina of cesar says widespread infestations of green peach aphid (GPA) contributed to the 2014 outbreak of BWYV, which is transferred into canola crops by aphids carrying the virus... SARDI plant pathologist Jenny Davidson said this funding was and will be used in a number of areas, including forensic analysis of canola paddocks; communication to growers and advisers (assisted in SA with an additional $40,000 in emergency funding provided by SAGIT); and preliminary assessment of virus levels in different canola varieties to identify if there are any useful levels of resistance to BWYV for future sowing recommendations...
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Catalogue: Ground Cover
Monitoring during autumn has shown that mouse numbers have remained low in many grain-growing regions across the country, but the pests have potential to cause damage at seeding in South Australia and Queensland ( Figure 1 )... The GRDC-funded study has forecast high levels of mouse pressure at sowing on SA's Eyre and Yorke peninsulas and the Northern Adelaide Plains, prompting many growers to bait with zinc phosphide... Modelling also forecasts high mouse numbers on Queensland's central Darling Downs...
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Catalogue: GRDC Media
Beet Western Yellows Virus (BWYV) has caused unprecedented damage to canola crops in south-east Australia this season, causing the GRDC to fund emergency research to analyse the outbreak and limit potential damage in future seasons... For growers who have severely infected crops and will suffer significant losses this year, this means no more measures can be taken to address the outbreak in those crops... Where growers have only patches of infection, or have crops not affected, Dr Davidson recommends close observation of the aphids...
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Catalogue: GRDC Media
Beet Western Yellows Virus (BWYV) has caused unprecedented damage to canola crops in south-east Australia this season, causing the GRDC to fund emergency research to analyse the outbreak and limit potential damage in future seasons... For growers who have severely infected crops and will suffer significant losses this year, this means no more measures can be taken to address the outbreak in those crops... Where growers have only patches of infection, or have crops not affected, Dr Davidson recommends close observation of the aphids...
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Catalogue: Broadacre Field Crops DAFF QLD
Cotton leafhopper, showing yellow-green, elongated body.. The current threshold for control through the early season is 50 leafhoppers per metre of row... Broad-spectrum insecticides can be used, but at the risk of reducing beneficial insect populations and creating outbreaks of other pests...
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Catalogue: Broadacre Field Crops DAFF QLD
Cotton leafhopper, showing yellow-green, elongated body.. The current threshold for control through the early season is 50 leafhoppers per metre of row... Broad-spectrum insecticides can be used, but at the risk of reducing beneficial insect populations and creating outbreaks of other pests...
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Catalogue: Ground Cover
Figure 1: Map of western region of Australia showing plant available soild moisture at 15 March 2006.. Eggs laid into moist soil in autumn will survive over winter and emerge in spring as soil temperatures rise again... Acknowledgements The locust risk map and past event statistics were provided by Kevin Walden and Entomology staff at DAFWA, and the soil moisture map was provided by David Stephens (DAFWA), using Bureau of Meteorology rainfall observations and the Patched Point Database...
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Catalogue: Broadacre Field Crops DAFF QLD
Image showing an NPV infected helicoverpa larve that has ruptured.. Maize: NPV will not control larvae sheltering in maize cobs but should give good control in silking maize if applied via a ground rig fitted with droppers targeted at the cob and silk area of the plant... Viral infection is much more complex, and resistance to NPV is much harder to develop...
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Catalogue: Broadacre Field Crops DAFF QLD
Image showing an NPV infected helicoverpa larve that has ruptured.. Maize: NPV will not control larvae sheltering in maize cobs but should give good control in silking maize if applied via a ground rig fitted with droppers targeted at the cob and silk area of the plant... Viral infection is much more complex, and resistance to NPV is much harder to develop...
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