Problems of control of insecticide‐resistantPlutella xylostella

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Abstract
In the different regions of SE Asia, resistance problems in the diamondback moth (DBM), Plutella xylostella, are comparable, and depend on the type of insecticide used to control this pest. Resistance is especially high to insecticides metabolised by mfos (multifunctional oxidases), but since the detoxification of each such insecticide depends on different mfo(s), there is little cross‐resistance between insecticides. Thus, carbaryl, carbofuran and the synthetic pyrethroids, all detoxified by mfos, show little cross‐resistance. Resistance to cartap and some organophosphorus insecticides is much lower, and is often unstable. Those compounds are therefore essential in the rational control of DBM. The cross‐resistance relationships within the traditional insecticides have mostly been worked out. It is thus possible to use alternate spraying schedules with insecticides conferring minimum cross‐resistance potential. Alternating insecticides is better than using mixtures, because DBM can develop multiple resistance through treatment with mixtures.DBM has now developed resistance to the newly‐introduced IGRs and other experimental control agents. Possible resistance to these as well as to future DBM control agents has been examined, and their resistance‐inducing ability and cross‐resistance characteristics examined. Experience in monitoring the spectrum together with the strength of resistance of field populations of DBM suggest that control can only be achieved by wellplanned rational chemical control programs.