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Repellency and Repulsiveness of Selected Agrichemicals to the Two-Spotted Spider Mite (Tetranychus urticae) on Grape Foliage

D. B. Walsh and G. G. Grove

December 2005


The study evaluated the repellency and repulsiveness of selected fungicides, insecticides, spray adjuvants and petroleum-derived spray oils to the two-spotted spider mite. Compounds were evaluated for their ability to stimulate mite movement from treated to nontreated grape tissue (repellency) and to inhibit movement from untreated to treated tissue (repulsiveness). All insecticides except Bacillus thuringiensis and some fungicides were highly repellent. Several insecticides and fungicides, and all spray adjuvants, were highly repulsive.


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