Australia
June 6, 2012
Researchers are seeking input from farmers and advisers to assist with their ongoing investigations into insecticide resistance in broadacre agricultural pests.
Entomologists engaged in research projects funded by the Grains Research and Development Corporation (GRDC) are searching for locations where growers have experienced chemical control difficulties or failures when dealing with insect pests, particularly mites and aphids.
In 2010 pirimicarb resistance was detected for the first time in Australia in populations of green peach aphid.
The research being led by cesar* and the University of Melbourne, in collaboration with entomologists across Australia, aims to identify areas at risk and provide early detection of resistant populations.
According to cesar’s Dr Paul Umina, insecticide resistance is an increasing issue for the grains sector.
“Entomologists suspect that the problem is more extensive than has been scientifically confirmed. We are therefore keen to map the geographical spread of the problem throughout Australia’s cropping and pasture regions,” Dr Umina says.
“A number of important crop pests have developed resistance due to the over-use and heavy reliance on chemicals. This includes Helicoverpa, diamondback moth, silverleaf whitefly, Western flower thrips, and several species of mites and aphids.
“Early detection of insecticide resistance in the field will allow management strategies to be implemented by growers to not only reduce pest damage, but minimise the risk of further spread,” Dr Umina said.
Dr Melina Miles of the Department of Agriculture, Fisheries and Forestry, Queensland, is encouraging grain growers, farmers and agronomists in Queensland and northern New South Wales to provide information that could assist industry with developing a greater understanding of insecticide resistance.
“Many growers in the northern region will be familiar with the challenge of managing Helicoverpa armigera which is resistant to synthetic pyrethroid, carbamate and organophosphate insecticides,” said Dr Miles.
“Growers who also grow cotton will know how complex insecticide resistance management can be when there are several pest species involved. This research aims to detect early signs of resistance development in key pests of grain crops.
“We want to hear from anyone who has experienced problems with insect pests, other than Helicoverpa, which appear to have some resistance to insecticide,” said Dr Miles.
Researchers also want to hear from landholders who have paddocks that have been subjected to heavy sprays in recent years so insect pest populations can be assessed to determine whether resistance is building or not. If growers or advisers know of a paddock with control failures in the past, they are also encouraged to make contact.
In 2010 pirimicarb resistance was detected for the first time in Australia in populations of green peach aphid. There is already resistance to synthetic pyrethroids and organophosphates in green peach aphids in Australia.
This is of particular concern to oilseed and pulse growers as this chemical has until now been seen as a fall back for aphid populations resistant to other chemical groups.
Any information obtained by the researchers from growers and advisers will be kept confidential. If resistance is detected alternative control options can be provided.
Reports can be made directly to Dr Miles on 07 46881369 or email melina.miles@daff.qld.gov.au.
More information on integrated pest management is available from the GRDC via www.grdc.com.au/pestlinks.
* cesar is a science-based company that delivers environmentally sustainable management solutions in agricultural pest control and wildlife conservation.
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