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Relative Cold Tolerance of Boll Weevils from Missouri, Mississippi, and Coastal Texas

Clyde E. Sorenson, Roy D. Parker, M. Blake Layton


Boll weevils (Anthonomus grandis grandis Bohman) from near Portageville, MO; Starkville, MS; and Corpus Christi, TX were exposed to temperatures of approximately -4, -7, -9, -12, and -15°C for 6 hours to determine if there were differences in the cold tolerance of these populations. No statistically significant differences were observed between these populations; survival at -3.9°C averaged 82.7 percent; at -6.7°C, 72.2 percent; and at -9.4°C, 61.5 percent. Survival at -12 and -15°C was negligible across populations. While boll weevils have been quite facile in adapting to varying winter climates by acquiring diapause, these data suggest that little adaptation to cold temperature has occurred at the northern limits of the boll weevil's range.

Reprinted from Proceedings of the 1996 Beltwide Cotton Conferences pp. 715 - 717
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998