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aphid infestation

Catalogue: GRDC Updates
We currently do not have a good understanding of the impact of aphids on winter cereal yield and quality in Australia... There have been relatively few trials that have demonstrated the relationship between aphid infestation and impacts on yield... The location of aphid infestations on the plant, and the timing of these infestations relative to crop maturity have a big impact on how yield and quality will be affected...
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Catalogue: GRDC Updates
The 2013 season demonstrated that the presence of armyworm in above threshold densities did not necessarily result in head lopping and associated crop losses... The season we set out to test the damage potential of armyworm in barley... Early work showed very high levels of infestation (up to 100% of racemes) resulted in no yield or oil content loss if the crop had adequate moisture...
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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: Broadacre Field Crops DAFF QLD
Winter cereals include wheat, barley, oats, canary and triticale... Insects are not normally a major problem in winter cereals but there will be times when they build up to an extent that control may be warranted... Small larvae take 8-10 days to reach a size capable of head lopping, so if small larvae are found in crops nearing full maturity/harvest no spray may be needed, whereas small larvae in late crops which are still green and at early seed fill may reach a damaging size in time to significantly reduce crop yield...
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Catalogue: Broadacre Field Crops DAFF QLD
Winter cereals include wheat, barley, oats, canary and triticale... Insects are not normally a major problem in winter cereals but there will be times when they build up to an extent that control may be warranted... Small larvae take 8-10 days to reach a size capable of head lopping, so if small larvae are found in crops nearing full maturity/harvest no spray may be needed, whereas small larvae in late crops which are still green and at early seed fill may reach a damaging size in time to significantly reduce crop yield...
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Catalogue: Broadacre Field Crops DAFF QLD
Winter cereals include wheat, barley, oats, canary and triticale... Insects are not normally a major problem in winter cereals but there will be times when they build up to an extent that control may be warranted... Small larvae take 8-10 days to reach a size capable of head lopping, so if small larvae are found in crops nearing full maturity/harvest no spray may be needed, whereas small larvae in late crops which are still green and at early seed fill may reach a damaging size in time to significantly reduce crop yield...
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Catalogue: GRDC Publications
GRDC Grains Research Update Goondiwindi, March 2014 as yields increase, i.e. the bug threshold for a 4t/ha soybean crop is twice that for a 2t/ha crop (Fig. 2), and similarly for mungbeans - see comparison between 1t/ha and 2t/ha crops (Fig. 3)... In summary, action thresholds for edible soybeans and mungbeans are set for bug populations predicted to damage 2% and 1.4% of seeds respectively... GRDC Grains Research Update Goondiwindi, March 2014 rule of thumb, aim to sample 5 widely-separated sites throughout a crop, with at least 4 x 1 m samples per site...
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