BRENDON CANT brendon at iinet.net.au
Thu Jan 3 02:08:36 CET 2008

NOXIOUS RUSSIAN: According to Dr Darryl Hardie, DAFWA entomologist in the
GRDC co-funded CRC for National Plant Biosecurity, analysis indicates a high
risk of severe loss in wheat growing areas if Russian wheat aphid, Diuraphis
noxia, enters Australia.

Dr Hardie says the pale green, spindle-shaped aphid up to 2.5mm in length,
has not yet been found in Australasia, but has been identified as an exotic


Aphid damaged plants display white longitudinal streaks on leaves and
sometimes stems.


Infested leaves curl and remain in a rigid, upright position. Infected
plants are stunted, sometimes with a flattened appearance, with tillers
almost parallel to the ground.


Most of the damage symptoms are due to aphid-injected toxin.


A serious pest of wheat and barley, Russian wheat aphid also affects
triticale, oats and rye.


The aphid has a history of high economic impact in the USA and the GRDC has
recently called for tenders for pre-emptive pre-breeding strategies to
address this potential exotic pest.

Contact: Dr Darryl Hardie, Tel 08 9368 3799


 Authorised by Grains Research & Development Corporation (GRDC)

 and issued on its behalf by

Brendon Cant & Associates, Tel 08 9384 1122





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