Brendon Cant brendon at iinet.net.au
Thu May 12 13:12:26 EST 2005

CAN’T CUT IT - Growers looking to save money this season are warned not to
cut herbicide rates, a practice which new research by the GRDC-supported WA
Herbicide Resistance Initiative has shown is costly because it can hasten
resistance development.
Paul Neve sprayed a known herbicide resistant ryegrass population with a
diclofop at varied rates, with survivors allowed to reproduce.
“The experiment showed that, when using a cut rate, a herbicide resistant
ryegrass population developed in just three generations,” Dr Neve said.
“The population was not only diclofop resistant but also cross resistant to
some other herbicide groups.
“Also, by cutting rates, there is a greater probability of killing less
weeds, with survivors reducing crop yield and injecting fresh weed seed into
the seedbank,” he said.
Contact: Dr Paul Neve, Email HYPERLINK
"mailto:P.Neve at warwick.ac.uk"P.Neve at warwick.ac.uk
READY SET GO - As viable herbicide options for wild radish diminish due to
increasing herbicide resistance, there is renewed interest in seed
production control to prevent viable seeds returning to the seed bank.
GRDC and CRC for Weed Management supported research by Aik Cheam of the
Department of Agriculture has established the most critical stage to control
seed-set is before the embryo forms in the developing seed.
At this stage, seed-set control as high as 90-100 per cent was achieved.
Growers can easily determine if an embryo is present by breaking up the pods
between the thumb and forefinger to expose the developing seed.
“This information will be highly valuable for growers and their advisors in
making decisions where timing of control measure is critical in the seed
management of wild radish,” Dr Cheam said.
Contact: Dr Aik Cheam, Tel 08 9368 3241
FORECAST FAVOURED - Up to 40 per cent of growers in southern Australia now
consider seasonal forecasts when decision making on-farm, according to a new
The survey found the proportion of growers using such climate risk tools
increased by 10 per cent between 2000 and 2002.
Managing Climate Variability Program Chair, Dale Baker of Hyden, said the
survey confirmed the benefit of the increased research effort across
southern and Western Australia in recent years.
As one example, Mr Baker said the GRDC currently funds additional projects
in climate risk management through the Managing Climate Variability Program.
Contact: Dale Baker, Mobile 0427 913 980
Brendon Cant & Associates
Public Relations & Marketing
114 Branksome Gardens
City Beach WA 6015
Tel 08 9385 7779 Fax 08 9385 7776

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