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Aflatoxins in Cottonseed: A Comparison of Two Cultivars¹

Two cotton cultivars, S-1322 and Deltapine-16, (Gossypium hirsutum L.) were compared in field plots in Imperial Co., Calif. in 1973, to determine causes of differences in severity of seed infection by Aspergillus flavus Lk. ex Ft. and in accumulation of aflatoxins. S-1322 was not as susceptible as Deltapine-16 because rapid moisture loss from the bolls creates an unfavorable environment for growth of A. flavus, and more bolls escape the pink bollworm [Pectinophora gossypiella (Saunders)] because of its flowering characteristics.

Key Words: Mycotoxins • Boll rot • Hard cottonseed • Impermeable seedcoat • Seed index • Linters

² Formerly plant physiologist, ARS-USDA, Western Cotton Research Laboratory, Phoenix, AZ 85040, currently research plant physiologist, ARS-USDA, Southern Region, Southeastern Fruit and Tree Nut Laboratory, Byron, GA 31008; agricultural research technician, Imperial Valley Conservation Center, Brawley, CA 92227; and agricultural research technician and crops research helper, ARS-USDA, Phoenix, AZ 85040, respectively.

Received for publication September 2, 1976.