Effect of Fungicide Seed Treatments and Seed Quality on Seedling Diseases and Yield of Cotton. E. B. Minton, USDA, ARS, Cotton Research Laboratory, Lubbock, TX 79401. G. C. Papavizas and J. A. Lewis, USDA, ARS, Soilborne Diseases Laboratory, Plant Protection Institute, Beltsville, MD 20705. Plant Dis. 66:832-835. Accepted for publication 30 December 1981. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1982. DOI: 10.1094/PD-66-832.

In greenhouse tests using soils artificially infested with Rhizoctonia solani and Trichocladium (= Thielaviopsis) basicola, treatment of cottonseed with carboxin 34 F + benomyl or technical carboxin + benomyl increased plant stands. In field tests using soil naturally infested with R. solani, T. basicola, Fusarium spp., Pythium spp., and Meloidogyne incognita, treatment of cottonseed with captafol, technical carboxin + captafol, thiram, chloroneb, and carboxin 34 F increased the number of surviving seedlings. Lint yields were higher but not significantly for all fungicide treatments than for the control. Application of fungicides to mechanically damaged seed increased the performance of Acala SJ-2 more than that of Stoneville 213. Captafol, thiram, carboxin 34 F, and technical carboxin + captafol increased seedling survival. Captafol appeared to reduce the adverse effects (phytotoxicity) associated with the application of technical carboxin in acetone.

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