Abstract
Abstract Larvae from a resident colony reared on artificial diet were preconditioned on clean chrysanthemum foliage for at least 24 h prior to the bioassay. Fresh foliage was dipped in treatment dilutions and allowed to air dry before presentation to larvae. Each dilution contained Plyac at 4 fl oz/100 gal. Bioassays were performed in 1-oz plastic creamer cups with plastic snap lids, 1 larva/cup. A section of moist filter paper was included in each cup to maintain humidity. There were 6 replicate groups of 10 cups/treatment. The experiment was repeated for second and fourth instars. Three posttreatment evaluations were made at 24-h intervals.
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