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Published in Crop Sci 12:189-190 (1972)
© 1972 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effects of Fungicide and Insecticide Seed Treatments on Germination, Stand, and Development of Cotton Seedlings1

Earl B. Minton2

At standard germination temperatures (20 to 30 C), percent germination of cotton (Gossypium hirsutum L.) seeds was not increased by treatments containing cyano (methylmercuri) guanidine (Panogen 15)3, pentachloronitrobenzene (PCNB), and O,O-diethyl S-2-[(ethylthio) ethyl] phosphorodithioate (disulfoton) as compared the untreated check. Germination was reduced by some treatments containing PCNB and disulfoton used alone and in combinations. Germination at constant 18 C was not affected by any treatment. In field and greenhouse tests conducted at sub-optimum temperatures, seedling survival was increased by Panogen 15 used alone and in combination with either PCNB or disulfoton or both as compared to the check. However, stands were not increased significantly by overcoating Panogen 15-treated seeds with PCNB and disulfoton as compared to Panogen 15 used along. In field and greenhouse tests phytotoxicity ratings of seedlings were related to application of disulfoton. There was a slight increase in phytotoxicity ratings for treatments containing the three pesticides as compared to treatments with disulfoton or with the insecticide plus either of the fungicides.

Key Words: Gossypium hirsutum L. • Phytotoxicity

1 Cooperative investigations of the Plant Science Research Division, Agricultural Research Service, USDA and Texas Agricultural Experiment Station, Texas A&M University.

2 Research Plant Pathologist, Plant Science Research Division, ARS, USDA, Texas A&M University Agricultural Research and Extension Center at Lubbock, Texas 79401.

Received for publication June 12, 1971.




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