Abstract
The growth and developmental patterns of the tobacco budworm, Heliothis virescens (F.), larvae reared. on cotton square diets of Stoneville 817 frego, Stoneville 105L (okra leaf), Stoneville 7A nectariless, Pee Dee 8619, and Pee Dee 875 did not differ appreciably from those reared on two standard cultivars, Stoneville 7A and DPL-16. However, growth was somewhat retarded on the okra leaf strain, and percent adult emergence was 20% less for insects reared on the Pee Dee 875 strain. Larvae reared on the two standards did not differ (P = 0.05) in any of the parameters measured Larvae reared on the high-gossypol strain, HGBR-8, and on the intermediately high-gossypol strain, HG469, exhibited the smallest larval weights and the longest developmental times. Larvae reared on the Stoneville 7A glandless strain exhibited the. largest larval weights and the shortest developmental times. Larval weight, pupal weight, and survival were inversely related to percent bud gossypol among the different cotton strains. Developmental time increased as percent bud gossypol increased.
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