Influence of Posttreatment Temperature on the Toxicity of Fenvalerate

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Abstract
Posttreatment temperature effects on the toxicity of fenvalerate (.alpha.-cyano-3-phenoxybenzyl-2-(4-chlorophenyl)-isovalerate) and other insecticides were assessed. Fenvalerate, pyrethrins and DDT were from 2.5-7.3 times more toxic to Spodoptera litura larvae at 15.degree. C than at 25.degree. C by topical application method and foliar dipping method. As for salithion and methomyl, LD50 values by topical application method were not affected by the post-treatment temperature, but the insecticidal activities by foliar dipping method showed a positive temperature coefficient. Fenvalerate, pyrethrins and DDT also showed a negative temperature coefficient of the paralyzing effect against S. litura, knockdown activity against Laodelphax striatellus and lethal activity against Plutella xylostella.

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