ABSTRACT
Experiments were conducted demonstrating developmental and reproductive disturbances by juvenoid insect growth regulators (jIGRs) in cotton aphid, Aphis gossypii Glover, and sweetpotato whitefly, Bemisia tabaci (Gennadius). Preliminary studies indicate that jIGRs disrupt homopteran population structures by arresting growth midway through nymphal development and interfering with JH-regulated reproductive functions. Kinoprene, fenoxycarb, and piperonyl butoxide induced juvenoid effects in cotton aphid and sweetpotato whitefly. Cotton aphids demonstrated an average three day delay in development and sweetpotato whiteflies an average two day delay in development when exposed to jIGRs. Glass vial bioassays for diazinon toxicity demonstrated that cotton aphids and sweetpotato whiteflies pre-exposed to jIGRs exhibited increased sensitivity to organophosphate insecticides. Based on these preliminary findings, jIGRs may play a significant role in future integrated management strategies.
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