Abstract
Soon after Tetranychus evansi was found as a new pest of tobacco in Zimbabwe, it appeared to have developed a tolerance to thiophosphate acaricides. Fifty-three pesticides (57 formulations) as foliar applications and five pesticides as soil-applied granules were screened in the laboratory. Initial indications of thiophosphate tolerance were corroborated, with possible cross-tolerance to some non-thio organophosphates. Acaricides from other chemical groups effectively controlled eggs, adults, or both eggs and adults of T. evansi, and provided ingredients for an acaricide rotation scheme to reduce selection pressure for resistance.
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