Abstract
Eighteen insecticides were tested on 4th-stage larvae of Hemerocampa vetusta (Boisduval). Eleven insecticides were highly toxic: pyrethroids were the most toxic. Six other insecticides gave toxicity indexes between 48 and 68 Four were only slightly more toxic than DDT. Two of the insecticides killed less than 50% of a test population at the highest dose tested, 1000 µg/g body weight. Although the western tussock moth has been reported to have 5 larval stages, 6 were observed. Larvae that molted to the 6th stage were usually female.
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