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crop edge

Catalogue: GRDC Media
Cabbage aphids living on the edge.. "Field trials at York and New Norcia in 2013 showed that cabbage aphids - which can cause feeding damage to canola crops in late winter and spring - tend to be distributed along crop edges," Mr Severtson said... Mr Severtson said that as well as highlighting the importance of weed control, the results implied that a border spray might be just as effective at controlling cabbage aphids as a full paddock spray, saving growers time and money...
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Catalogue: GRDC Media
"Field trials at York and New Norcia in 2013 showed that cabbage aphids - which can cause feeding damage to canola crops in late winter and spring - tend to be distributed along crop edges," Mr Severtson said... Caption 2 : Researcher Dusty Severtson, of UWA and DAFWA, in a New Norcia paddock - one of the sites for field trials researching the distribution of cabbage aphids... Mr Severtson said that as well as highlighting the importance of weed control, the results implied that a border spray might be just as effective at controlling cabbage aphids as a full paddock spray, saving growers time and money...
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Catalogue: GRDC Media
Research shows cabbage aphids living on the edge.. "The new research clearly suggests that infestation of racemes occurs later in the growing season, and that in the weeks prior, the same canola plants host cabbage aphids feeding on leaves in the bottom of the canopy," Mr Severtson said... Mr Severtson said that in some years, cabbage aphids and other species such as turnip aphids could cause widespread damage in late winter and spring by feeding on growing canola shoot tips, causing wilting, flower abortion and reduced pod set...
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Catalogue: GRDC Research Summaries
The objective of the project is to develop a training and research resource in applied entomology that can serve the future needs of the Australian grains industry nation-wide... In Australia, as in other countries, there has been a decline in education and training courses in applied entomology such that the supply of trained researchers and field entomologist world-wide has decreased markedly... Plot and glasshouse trials for spider mites in maize and redlegged earth mites and aphids in canola indicate that insect pests prefer host plants affected by an imbalance of certain nutrients...
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Catalogue: GRDC Media
Beet western yellows virus, spread by green peach aphids, has severely damaged canola crops in parts of the southern region.. "The experts agree that growers should give serious consideration as to whether spraying to control GPA while winter conditions persist in the southern cropping region is warranted," Dr Taylor said... Studies funded by the GRDC have found that the extent of insecticide resistance in GPA across Australia has escalated as a result of heavy reliance on insecticides to manage aphid populations, placing strong selection pressure on the insect to develop resistance and leaving growers with limited future control options...
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Catalogue: GRDC Media
Canola virus: winter spraying may not be warranted.. Beet western yellows virus, spread by green peach aphids, has severely damaged canola crops in parts of the southern region.. Studies funded by the GRDC have found that the extent of insecticide resistance in GPA across Australia has escalated as a result of heavy reliance on insecticides to manage aphid populations, placing strong selection pressure on the insect to develop resistance and leaving growers with limited future control options...
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Catalogue: GRDC Media
Research shows cabbage aphids living on the edge.. "The new research clearly suggests that infestation of racemes occurs later in the growing season, and that in the weeks prior, the same canola plants host cabbage aphids feeding on leaves in the bottom of the canopy," Mr Severtson said... Mr Severtson said that in some years, cabbage aphids and other species such as turnip aphids could cause widespread damage in late winter and spring by feeding on growing canola shoot tips, causing wilting, flower abortion and reduced pod set...
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Catalogue: GRDC Updates
Figure 1: Disease cycle of TSV Take home message.. A severe sunflower decline disease, now known to be caused by Tobacco streak virus (TSV), has caused a loss of approximately 20% across the sunflower industry in central Queensland (CQ) since 2004... Results of the disease incidence would correlate with differences in expected yield...
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