Abstract
The toxicity of 15 citricultural pesticides to a San Joaquin Valley, California strain of Euseius hibisci (Chant) were evaluated in laboratory bioassays by use of the leaf disc-dip technique. Compounds of low toxicity were parathion, carbaryl, sabadilla, and fenbutatin-oxide. Malathion, methidathion, and propargite were moderately toxic to E. hibisci. Compounds highly toxic to this predatory phytoseiid were methomyl, acephate, cyhexatin, dimethoate, dicofol, chlorpyrifos, oxythioquinox, and chlorobenzilate. Adult females were highly sensitive to methomylleaf residues. A majority of females moved off into the water barrier soon after their placement on the treated surface at levels as low as 0.94 g (AI)/100 liters. The potential for augmentation and conservation of the strain for the biological control of spider mites and citrus thrips in San Joaquin Valley citrus integrated pest management programs are suggested.
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