Abstract
Five synthetic pyrethroids were tested alone and in combination with chlordimeform (CDF) for toxicity to Heliothis virescens (F.) and Chrysopa carnea (Stephens). Insecticides-CDF combinations were highly synergistic against the tobacco budworm (TBW) with synergism levels ranging from 7- to 63-fold. CDF alone was highly toxic to C. carnea . All pyrethroid-CDF combinations were highly selective against the TBW except for phenothrin-CDF, and the degree of selectivity was greater at the LC90 than the LC50. Based on these data, pyrethroid-CDF combinations may play an effective role in integrated pest management programs for TBW on cotton.
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