All aphids were moderately to highly resistant to organophosphate (OP) insecticides, while approximately half of aphids tested were at least partially resistant to pyrethroids... Preliminary data has shown that a 20 metre (m) border spray on the crop edge is sufficient to prevent most aphids released adjacent to a wheat crop from successfully colonising the crop... The 2001 and 2002 populations have been evaluated for insecticide resistance against two insecticides: dimethoate # (OP) and alpha-cypermethrin # (SP)...
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