Potentiated mixtures of hexythiazox, clofentezine, silwett L77 and a mineral oil for the control of twospotted spider mite (Tetranychus urticae Koch) : a dissertation submitted in partial fulfilment of the requirements for the Degree of the Bachelor of Horticultural Science (Honours) at Lincoln University

Abstract

Twospotted spider mite, Tetraychus urticae Koch. eggs were used in a laboratory investigation of the cotoxicities of hexythiazox (tradename:Nissorun), clofentezine (tradename:Apollo), silwett L77 (tradename:Pulse) and a mineral oil (Sunspray). Potentiation was obtained from combining combinations of hexythiazox/silwett L77, clofentezine/silwettL77 and clofentezine/mineral oil. Hexythiazox/mineral combination oil did not result potentiation. However cotoxicity responses at varying concentrations were not consistent, the potentiated effect mainly occurred at the higher concentrations. Results at all stages of the experimental bioassay procedure contained high associated errors and the bioassay method needs to be standardised in future work investigating cotoxicity.