Resistance due to insensitive acetylcholinesterase in peach-potato aphids, Myzus persicae
1997
Foster, S.P. | Harling, Z.K. | Moores, G.D. | Devonshire, A.L. (IACR-Rothamsted, Hertfordshire (UK))
The insecticide resistance problems caused by the ubiquitous esterase-based mechanism in Myzus persicae have been compounded recently by the appearance of strains carrying a new mechanism based on insensitivity of acetylcholinesterase (AChE), the target enzyme for oPs and carbamates. The insensitivity in this species primarily affects pirimicarb and triazamate, which are some of the most effective insecticides for overcoming esterase-based resistance. Insensitive AChE forms were seen for the first time in the UK in 1995 at an extremely low frequency in Rothamsted Insect Survey suction traps, and at high frequencies on field crops in 1996 where they were associated with severe control problems on potatoes and brassicas. Biochemical diagnostics for identifying these mechanisms in individual aphids will be described, along with aphid selection experiments in large population cages on sugar beet, in which different insecticides were applied to aphid populations carrying various permutations of the two resistance mechanisms.
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