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Partial Suppression of Boll Weevil Oviposition by a Primitive Cotton¹

Four photoperiodic, primitive race stocks of cotton, Gossypium hirsutum L., which had previously exhibited resistance to oviposition by the boll weevil, Anthonomus grandis Boheman, were each crossed to ‘Deltapine 16’ and subsequently selected for the dayneutral flowering habit. These progeny were then backcrossed twice to their respective original primitive stocks and selected for day neutrality after each backcross. The resulting progenies were evaluated using a laboratory technique which measures boll weevil oviposition. Weevils oviposited significantly ( = 0.10) less often on a BC₂F₃ progeny of T-78 than on the controls, Deltapine 61 and ‘Stoneville 213’. The level of resistance in the day-neutral T-78 progeny approached that of the original photoperiodic stock. No differences in amount of oviposition among the controls and the other three BC₂F₃ progenies (i.e., T-80, T-759, and T-1149) were detected.

Key Words: Host-plant resistance • Gossypium hirsutumL • Anthonomus grandisBoheman

² Research agronomist, research geneticist, and research entomologist, respectively, Crop Sci. and Eng. Res. Lab., P. O. Box 5367, Mississippi State, MS 39762.

Received for publication March 10, 1981.