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Field Evaluation of Glanded and Glandless Cotton (Gossypium hirsutum L.) Lines for Boll Weevil (Anthonomus grandis Boh.) Susceptibility¹

The boll weevil is the major cotton insect in the rain grown cotton belt. We investigated glandless cottons to determine if they were more susceptible to the boll weevil than the currently grown glanded varieties. Two years' results from large field plots with two pairs of glanded glandless cottons indicated that the glandless genes gl₂ and gl₃ did not cause greater susceptibility in the Acala 4-42-77 and Rex Smoothleaf lines. Thirteen pairs of glanded-glandless lines were compared in small field plots. In each of the 13 comparisons no significant differences were found. Antibiosis tests showed slightly larger weevils on some glandless lines. These data suggest that the glandless character should not create any increased boll weevil susceptibility, especially with careful selection of genetic background.

Key Words: glandless cotton • cotton • boll weevil • Anthonomus grandis • Gossypium hirsutum • resistance • susceptibility

² Research Geneticist, Crops Research Division, and Adjunct Associate Professor of Crops; Research Entomologist, Entomology Research Division, and Adjunct Associate Professor of Entomology; and Entomologist, Entomology Research Division, all of the Boll Weevil Research Laboratory, ARS, USDA, State College, Miss.

Received for publication February 11, 1967.

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