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Genetic Resistance to Boll Weevil Oviposition in Primitive Cotton¹

Boll weevil (Anthonomus grandis Boheman) resistance was identified in several photoperiodic primitive accessions of cotton (Gossypium hirsutum L.) in the early 1970s. Twof these primitive accessions, T-326 and T-1180, were each crossed to ‘Deltapine 16’ and progeny with day-neutral (DN) flowering habit were selected. These progeny were then backcrossed twice to their respective primitive parent and selected for day neutrality after each backcross. The resulting progenies were evaluated for boll weevil oviposition using a new laboratory technique. Significantly less oviposition was found on BC₂F₄ progeny of T-326(DN) and T-1180(DN) than on the control, ‘Stoneville 213’. These progeny expressed resistance as 57 and 54% as much oviposition, respectively, as on Stoneville 213 in the laboratory test; resistance also was noted by others in field tests. The level of boll weevil resistance found in the progenies of T-326(DN) and T-1180(DN), when combined with acceptable agronomic performance, should be of value in pest management.

Key Words: Gossypium hirsutum L. • Anthonomus grandis Boheman • Host plant resistance

² Research agronomist, research geneticist, and research entomologist, respectively, USDA-ARS, Crop Science Res. Lab., P. O. Box 5367, Mississippi State, MS 39762-5367.

Received for publication May 12, 1986.