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Effects of Weed Control in Grain Sorghum on Subsequent Incidence of Verticillium Wilt in Cotton. Earl B. Minton, Research Plant Pathologist, Plant Science Research Division, ARS, USDA, in cooperation with the Texas A&M University Agricultural Research and Extension Center, Lubbock, Texas 79401; Phytopathology 62:582-583. DOI: 10.1094/Phyto-62-582.

Incidence of Verticillium wilt in cotton planted after 4 years of grain sorghum infested with Amaranthus spp. was higher than in cotton planted after 4 years of weed-free grain sorghum. Wilt was also more severe in three successive annual plantings of cotton which followed only 2 years’ culture of weedy grain sorghum.

Additional keywords: Gossypium hirsutum, Sorghum bicolor, Amaranthus retroflexus, Verticillium albo-atrum, yield, Micronaire.