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Effects of Pilose, Pubescent, and Smooth Cottons on the Cotton Leafperforator¹

Strains of cotton (Gossypium hirsutum L.) deviating in both directions from the degree of pubescence typical of upland cotton, were more resistant than the latter to cotton leafperforator (Bucculatrix thurberlella Busck). Two densely hairy lines, TM-I(H₂) and SA 166, harbored significantly fewer insects than any of the other lines tested. Nonpreference for oviposition is probably the main mechanism of resistance involved. A no-choice greenhouse feeding technique was devised that should be useful in screening cottons for resistance to cotton leaf perforator.

Key Words: Host plant resistance • Gossypium hirsutum L. • Bucculatrix thurberiella Busck

² Research entomologist and research geneticist, respectively, Western Cotton Res. Lab., ARS, USDA, 4135 E. Broadway Rd., Phoenix, AZ 85040.

Received for publication February 3, 1975.

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