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Abstract
The 48-h residual toxicity of major pesticides used for control of citrus thrips, Scirtothrips citri (Moulton), and California red scale, Aonidiella aurantii (Maskell) , in California was evaluated for adults of Aphytis melinus DeBach and Cryptolaeumus montrouzieri Mulsant. Rates as high as 4-fold the highest recommended field rate revealed little effect of sabadilla to A. melinus or of sabadilla, dimethoate, formetanate, or chlorpyrifos to C. montrouzieri . Concentration-mortality regressions were quantified for the remainder of the materials; these showed toxicity (at LC50) of chlorpyrifos > carbaryl > dimethoate > acephate > parathion > formetanate > methidathion to A. melinus and carbaryl > acephate > parathion > methidathion to C. montrouzieri .
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