Factors Affecting Juvenile Hormone Analogue Activity in the Tobacco Budworm1,2

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Tests showed last instars of Heliothis virescens (F.) to he the larval stage most sensitive to juvenile hormone (JH) analogues based on morphological defects in the pupal stage. Peak sensitivity of the last in star to a JH analogue appcared 2 days after ecdysis, When treating last instars. greater effects (up to 10-fold) were observed when the same dosage was extended over a 3-day period. Intrahemocoelic injections of a JH analogue produced fewer deformities than topical applications. Comparing ~ poStlrc:1IIlH'llt temperatures, the higher gave a 2 to 9-fold increase in effectiveness over the lower temperature. Differences in tolerance to JH analogues were shown to exist in 2 strains of tobacco budworms. The insecticidally resistant strain proved to be more tolerant to JH analogues than the susceptible strain.

Additional studies revealed that Heliothis eggs also were sensitive to JH analogues based on failure to hatch. These ovicidal tests indicated that sensitivity was greater when eggs were less than 12-hollrs old.

Document Type: Research Article

Publication date: February 1, 1973

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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