ABSTRACT
Apron, Epic, and Imazalil control primarily Pythium, Rhizoctonia, and Thielaviopsis, respectively. In 1985, each fungicide was applied alone and in combinations to acid-delinted seed of Stoneville 213 to determine their effects on plant stand establishment at Stoneville, MS, Keiser, AR, College Station, TX, and Shafter, CA. Two planting dates, April 16 and May 1, were used at Stoneville, while one planting date was used at all other locations. Lint yields were also recorded at Stoneville and College Station. When a single fungicide was used, percent seedling survival was the highest for Apron and the lowest for Epic in the tests at all locations, except the April 16 planting at Stoneville. In the latter test, Epic and Imazalil produced the highest and lowest plant stands, respectively. The highest overall percent seedling survival was obtained with Apron + Epic and the second highest was with Apron + Epic + Imazalil. Lint yields among the treatments were similar for each planting date and across planting dates at Stoneville. Lint yields were higher for all fungicide treatments than for the check at College Station, and they were increased significantly by all fungicide treatments except Epic alone and Apron + Epic. At both locations, the highest yield was obtained with Apron + Epic + Imazalil. The data indicate that Pythium, Rhizoctonia, and Thielaviopsis should be controlled for maximum plant stands and lint yield.
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