BRENDON CANT brendon at iinet.net.au
Wed Sep 26 05:53:49 CEST 2007

MOTH MATTERS: GRDC supported DAFWA entomologist, Kevin Walden has urged
growers in the Northampton and Eradu areas to sample for Diamond Back Moth,
using sweep netting, now that DBM caterpillars have been reported.


"Sweep net sampling every five days is essential for good decision-making
for control," he said.


"Many samples of 10 sweeps should be made in different parts of the paddock,
as grubs can be unevenly distributed, occurring in high numbers in a crop
corner or edge of the paddock.


"When average grub numbers per each 10 sweep sample exceed 150, control
measures should be implemented immediately," he said.


In high risk situations, two sprays may be required to contain numbers with
a second spray within seven days of the first.

Contact: Kevin Walden, Tel 08 9956 8539



LIGHT SHINES ON BUDWORM: According to GRDC 2007 Seed of Light winner, Peter
Mangano of DAFWA, native budworm caterpillars have been found in damaging
numbers in pulse and canola crops in WA's northern and eastern grainbelt.


"Many field pea, faba bean, lentil and chickpea crops have been sprayed as
caterpillar numbers have risen above economic threshold levels and growers
continue to monitor lupin and canola crops that could be at risk as they
approach maturity," he said.


Native budworm moth numbers are provided each week by volunteer farmers and
DAFWA staff. 


The numbers are then published on the GRDC supported PestFax service to
provide an advanced warning to pulse and canola growers of the likely risk
of budworm caterpillars being found in crops. 


Mr Mangano reminded growers that although moth counts were useful, they were
no substitute for the essential sweep netting of crops to determine actual
numbers of caterpillar present.


"If damaging numbers of budworm caterpillars are present, one well timed
spray of a registered rate of synthetic pyrethroid chemical will be
sufficient in most situations to control native budworm," Mr Mangano said.

Contact: Peter Mangano, Tel 08 9368 3753



 Authorised by Grains Research & Development Corporation (GRDC)

 and issued on its behalf by

Brendon Cant & Associates, Tel 08 9384 1122




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