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Catalogue: GRDC Updates (West)
Mention of a trade name or company in this publication does not imply endorsement of any product or company by the Department of Agriculture and Food, Western Australia... Overall, 60-70 per cent of flour is used in traditional flat breads, 20-25 per cent of flour is used in western style breads and 5-10 per cent is used in cakes and biscuits... In summary, canola varieties sown 2-3 weeks earlier than normal (early to mid April) can be grazed in winter prior to bud elongation (usually providing 600-800 dse grazing days/ha) and recover with no impact on yield or oil...
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Catalogue: Ground Cover
Ms Ganesalingam applied biometric techniques to analyse seven years of national canola blackleg resistance trial data, providing what her supervisor at the University of Western Australia, Professor Wallace Cowling, describes as a "remarkable improvement" in the stability of the analysis... With the long-term analysis over seven years, Aanandini found that some varieties have stable variety resistance ratings," says Professor Cowling. ".. By using the latest MET analysis, Aanandini has shown that large GxE interactions occur in canola blackleg disease across sites over the years but this GxE can be modelled to improve the analysis and thereby improve our understanding of blackleg resistance in canola varieties," she says. "..
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Catalogue: GRDC Updates
Glyphosate resistance in annual ryegrass and other weeds is fast increasing in Australia... Resistance may result from immigration of resistant genes, not just from repeated applications of herbicides from the same mode of action... Since glyphosate resistance in weeds is so important for farming systems of Western Australia, it is necessary to know how many annual applications of glyphosate (at low and high rates) are required to develop glyphosate resistance in annual ryegrass in the absence of cropping, grazing and application of herbicides from other modes of action...
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Catalogue: GRDC Media
A new testing service is being offered to grain growers and advisers to determine the presence of insecticide resistance in green peach aphid (GPA) populations... The service is being made available through cesar with the support of the Grains Research and Development Corporation (GRDC) to assist growers in choosing the most effective product for controlling GPA... Anthony van Rooyen, of cesar, says resistance in GPA has escalated as a result of heavy reliance on insecticides...
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Catalogue: GRDC Media
A new testing service is being offered to grain growers and advisers to determine the presence of insecticide resistance in green peach aphid (GPA) populations... The service is being made available through cesar with the support of the Grains Research and Development Corporation (GRDC) to assist growers in choosing the most effective product for controlling GPA... Anthony van Rooyen, of cesar, says resistance in GPA has escalated as a result of heavy reliance on insecticides...
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Catalogue: GRDC Final Reports
No aphids were collected with MACE resistance to carbamate insecticides, including pirimicarb # - the insecticide widely recommended for GPA control in Australia... There was also no evidence of imidacloprid # resistance in Australian GPA. Border treatments were effective in reducing aphid immigration and virus transmission into canola paddocks from nearby sources, but further study is necessary to determine the effects on aphids arriving from longer distances... The results indicate that an 18 m buffer of Gaucho-treated plants has a significant effect on the immigration of aphids and the introduction of virus into canola paddocks when the aphids are arriving from adjacent areas...
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Catalogue: GRDC Final Reports
Three accessions of Medicago truncatula were identified showing different degrees of resistance to Therioaphis trifolii through three resistance modalities... The objectives of the project were to identify the genetic basis and to decipher the defence mechanisms of resistance to T. trifolii in M. truncatula ... The results of the research will provide valuable resources to determine the molecular basis of plant recognition and signalling in response to aphid feeding, and will also be important in identifying key factors involved in aphid virulence and host resistance...
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Catalogue: Ground Cover
Recent GRDC-funded research has uncovered widespread resistance among green peach aphid populations to pirimicarb, synthetic pyrethroids and organophosphates in Victoria, South Australia, New South Wales, Queensland and Western Australia... Department of Agriculture and Food, WA (DAFWA), PestFax coordinator Peter Mangano says grain growers have experienced significant issues with resistance in green peach aphid this season... Dr Umina says: "If we discover that individual aphids have resistance to organophosphates, synthetic pyrethroids and carbamates, it will mean the likely reproduction of fully resistant offspring, as green peach aphids can reproduce asexually to produce clones of themselves...
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Catalogue: GRDC Final Reports
All aphids were moderately to highly resistant to organophosphate (OP) insecticides, while approximately half of aphids tested were at least partially resistant to pyrethroids... Preliminary data has shown that a 20 metre (m) border spray on the crop edge is sufficient to prevent most aphids released adjacent to a wheat crop from successfully colonising the crop... The 2001 and 2002 populations have been evaluated for insecticide resistance against two insecticides: dimethoate # (OP) and alpha-cypermethrin # (SP)...
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Catalogue: GRDC Final Reports
The project has made excellent progress in identifying key genes linked to oxidative stress that, when mutated, make the model plant Arabidopsis highly susceptible to AG8... The project has also identified other genes whose expression is highly induced following R. solani infection in Arabidopsis and wheat... The exciting results were further supported by large scale analysis of gene expression that revealed the resistance to AG8 was associated with the activity of a number of genes linked to the generation of ROS and similar induction of ROS related genes was seen in wheat after AG8 infection using microarrays...
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