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resistance level

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Catalogue: Ground Cover
Help needed for herbicide resistance survey.. The survey, which will run across the northern grains region, also represents the first comprehensive investigation into herbicide-resistance levels in Queensland and aims to collect samples from 600 paddocks... "At a farm level growers need to know the resistance levels in their paddocks, so they aren't wasting money and time with ineffective chemicals or weed management strategies, so participating in this survey is one way to get that information for free," Dr Widderick says...
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Catalogue: GRDC Updates
Ryegrass and sow thistle were evaluated in this project; other weeds such as wild oats, wild radish, mustards, poppy, etc. are also developing resistance in this region... The aim of the project was to capture the current resistance status of a large sample of ryegrass and sow thistle; to key pre-emergent and post emergent herbicides in the western riverina region of SW NSW... What was very interesting was the level of resistance measured in samples with no expected resistance...
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Catalogue: Ground Cover
GRDC-supported PhD student Mechelle Owen has built up one of the most comprehensive pictures of the spread of herbicide resistance over the past decade... Ms Owen, who is a senior researcher with the Australian Herbicide Resistance Initiative (AHRI) in Perth, has collected and analysed thousands of weed samples to document their resistance levels to a vast suite of herbicides commonly used across Australia... Research has shown ryegrass seed collected from more heavily cropped paddocks across the grainbelt has higher rates of dormancy and herbicide resistance than those with a lighter or no history of cropping...
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Catalogue: GRDC Updates
Two surveys of the southern New South Wales cropping area have been conducted in recent years, roughly divided by a line from Forbes through Temora to Corowa, to the east in 2007 and to the west in 2010 (Figure 1)... Figure 1: Location of sample sites for the 2007 and 2010 surveys In the 2007 survey high levels of resistance in annual ryegrass were found to diclofop (81%) and the two Group B herbicides, chlorsulfuron (70%) and imazaic/imazapyr (65%) (Table 2)... The only previous survey of southern New South Wales was conducted in 1991 and found resistance levels for diclofop to be 14%, sethoxydim at 12% chlorsulfuron at 11% and trifluralin at 12%...
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Catalogue: GRDC Updates (West)
Determine which herbicides still provide effective weed control 2010 Resistance Survey.. Sulfometuron Group B populations had resistant 98% of plants.. Atrazine - only 2% of populations had resistant plants..
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Catalogue: GRDC Factsheets
" Revised July 2015 Resistance ManageMent stRategyfoRthegReenpeach aphid in austRalian gRains Key points Green peach aphids (GPA) are a widespread and damaging pest of canola and a range of pulse crops, causing damage by feeding and transmitting viruses... Five chemical subgroups are registered to control GPA in grain crops: carbamates (Group 1A); synthetic pyrethroids (Group 3A); organophosphates (Group 1B); neonicotinoids (Group 4A); and sulfoxaflor (Group 4C)... A strategy to manage insecticide resistance in GPA populations is available for use by grain growers and their advisers...
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Catalogue: Ground Cover
The agronomist from Dubbo, New South Wales, says two years of survey data show herbicide resistance is increasing at an alarming rate across the central western NSW cropping belt and growers need to change tactics urgently to develop effective, long-term weed-management strategies... "In the GOA surveys both ryegrass and black oats demonstrated a high incidence of resistance, with 100 per cent of the ryegrass and 86 per cent of black oats showing resistance to at least one herbicide," Mr Street says... Before growers and agronomists decide on a course of action, Mr Street says it is critical they start testing survivor weed samples so they can map the resistance status of individual farms and paddocks as part of the process to develop effective long-term strategy for the management of hard-to-kill weeds...
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Catalogue: Ground Cover
The agronomist from Dubbo, New South Wales, says two years of survey data show herbicide resistance is increasing at an alarming rate across the central western NSW cropping belt and growers need to change tactics urgently to develop effective, long-term weed-management strategies... "In the GOA surveys both ryegrass and black oats demonstrated a high incidence of resistance, with 100 per cent of the ryegrass and 86 per cent of black oats showing resistance to at least one herbicide," Mr Street says... Before growers and agronomists decide on a course of action, Mr Street says it is critical they start testing survivor weed samples so they can map the resistance status of individual farms and paddocks as part of the process to develop effective long-term strategy for the management of hard-to-kill weeds...
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Catalogue: GRDC Factsheets
" Revised July 2015 Resistance ManageMent stRategyfoRthegReenpeach aphid in austRalian gRains Key points Green peach aphids (GPA) are a widespread and damaging pest of canola and a range of pulse crops, causing damage by feeding and transmitting viruses... A strategy to manage insecticide resistance in GPA populations is available for use by grain growers and their advisers... Other general recommendations include: assess aphid and beneficial populations over successive checks to determine if chemical control is warranted; use economic spray thresholds where available; where GPA is colonising crop margins in the early stages of population development, consider a border spray with an insecticide to prevent/delay the build-up of GPA and to retain beneficial insects; avoid repeated applications of products from the same insecticide group on GPA and other pests in the same paddock;..
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Catalogue: GRDC Factsheets
" Revised July 2015 Resistance ManageMent stRategyfoRthegReenpeach aphid in austRalian gRains Key points Green peach aphids (GPA) are a widespread and damaging pest of canola and a range of pulse crops, causing damage by feeding and transmitting viruses... A strategy to manage insecticide resistance in GPA populations is available for use by grain growers and their advisers... Other general recommendations include: assess aphid and beneficial populations over successive checks to determine if chemical control is warranted; use economic spray thresholds where available; where GPA is colonising crop margins in the early stages of population development, consider a border spray with an insecticide to prevent/delay the build-up of GPA and to retain beneficial insects; avoid repeated applications of products from the same insecticide group on GPA and other pests in the same paddock;..
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