[ASC-media] 'MITEY' BIG PROBLEM: GRDC Grain Flash

BRENDON CANT brendon at iinet.net.au
Wed Apr 23 05:32:05 CEST 2008

'MITEY' BIG PROBLEM: With no effective miticides or Wheat Streak Mosaic
Virus (WSMV) resistant wheat varieties available, hygiene measures, such as
controlling volunteer cereals or grasses during summer and completely
removing them two weeks before sowing, is recommended.  <?xml:namespace
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Less than 0.2 millimetres long, Aceria tosichella, or Wheat Curl Mite,
transmits WSMV.


It is active after surviving summer on host plants if there is sufficient
autumn rain to establish a 'green bridge' of grasses and volunteer cereals,
enabling transfer of WSMV to adjacent crops.


The mite can't live long without suitable green plant material, so regions
with 100 mm or more rainfall in January to March are at the greatest risk of
an outbreak.


GRDC supported DAFWA entomologist, Geoff Strickland said it typically
colonises the youngest tissue of wheat plants, causing longitudinal rolling
of leaves with high mite populations.


WSMV symptoms include light green-yellow, discontinuous streaks and dashes
parallel to veins.


"Unfortunately, symptoms are easily confused with nutritional disorders,
environmental effects and chemical damage," he said.


For more information, visit the GRDC supported website HYPERLINK

Contact: Geoff Strickland, Tel 08 9368 3756 or Mob 0404 819 611


 Authorised by Grains Research & Development Corporation (GRDC)

 and issued on its behalf by

Brendon Cant & Associates, Tel 08 9384 1122


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3:51 PM

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