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aphid population

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Catalogue: Broadacre Field Crops DAFF QLD
Adults and nymphs form dense colonies which appear bluish-grey and are covered with a fine, whitish powder... Nymphs are greenish and adults are a dull or greyish-green... Adults and nymphs suck on sap and high numbers can result in reduced pod set, pod fill and grain quality...
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Catalogue: Broadacre Field Crops DAFF QLD
Adults and nymphs form dense colonies which appear bluish-grey and are covered with a fine, whitish powder... Nymphs are greenish and adults are a dull or greyish-green... Adults and nymphs suck on sap and high numbers can result in reduced pod set, pod fill and grain quality...
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Catalogue: Broadacre Field Crops DAFF QLD
Adults and nymphs form dense colonies which appear bluish-grey and are covered with a fine, whitish powder... Nymphs are greenish and adults are a dull or greyish-green... Adults and nymphs suck on sap and high numbers can result in reduced pod set, pod fill and grain quality...
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Catalogue: GRDC Factsheets
Growers in high rainfall zones should be proactive and develop a Barley Yellow Dwarf Virus (BYDV) management plan which includes crop monitoring, green bridge management, foliar pesticide sprays and pre-sowing seed treatment... Trial results have found that the oat and rose grain aphid are found on wheat and barley and the corn aphid favours barley and is rarely found on wheat... Even where there have been large yield losses due to BYDV, trial results have not shown any difference in protein content between sprayed and untreated plots...
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Catalogue: Broadacre Field Crops DAFF QLD
Photograph of Cotton aphids showing variations in colour - some yellow and some black.. Image showing leaf distortion damage caused by cotton aphids.. The cotton aphid may be troublesome during the seedling stage when its feeding may result in plants being stunted...
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Catalogue: GRDC Factsheets
Growers in high rainfall zones should be proactive and develop a Barley Yellow Dwarf Virus (BYDV) management plan which includes crop monitoring, green bridge management, foliar pesticide sprays and pre-sowing seed treatment... Trial results have found that the oat and rose grain aphid are found on wheat and barley and the corn aphid favours barley and is rarely found on wheat... Even where there have been large yield losses due to BYDV, trial results have not shown any difference in protein content between sprayed and untreated plots...
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Catalogue: GRDC Factsheets
Growers in high rainfall zones should be proactive and develop a Barley Yellow Dwarf Virus (BYDV) management plan which includes crop monitoring, green bridge management, foliar pesticide sprays and pre-sowing seed treatment... Trial results have found that the oat and rose grain aphid are found on wheat and barley and the corn aphid favours barley and is rarely found on wheat... Even where there have been large yield losses due to BYDV, trial results have not shown any difference in protein content between sprayed and untreated plots...
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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 Updates
Three varieties were evaluated at each site (Fitzroy , Grout and Gairdner ) with four replicates of all treatments... The pattern was common in all trials assessed to the end of September... Gilgandra Pirimor (300 g/ha) and dimethoate were applied to a population of ~36 aphids/tiller in early October, ~3-4 weeks after all other sites, when all varieties had completed head emergence...
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Catalogue: Broadacre Field Crops DAFF QLD
Adult oat or wheat aphid, parasitised mummy with healthy aphid.. Aphids can affect any crop stage but are unlikely to cause economic damage to cereal crops expected to yield less than three tonne per hectare... Chemical control: Apply a foliar insecticide in late winter or spring to avoid direct damage to tillers and heads...
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