Cotton Seedling Disease Management on the Texas High Plains

Harold W. Kaufman, John R. Gannaway, and James R. Supak


 
ABSTRACT

Fungi causing cotton seedling disease on the Texas high plains include Pythium sp., Rhizoctonia solani, Thielaviopsis basicola and Fusarium sp. They appear to be uniformally distributed across the area. Rotation and timely planting have been used to reduce losses to seedling disease but using high quality seed and combination fungicide treatments for specific fungi are not common practices. Earlier tests have shown increased emergence, over the standard captan, with higher quality seed and increased emergence with a combination of two fungicides specific for Pythium and Rhizoctonia. Twenty treatments were compared in three on farm tests in sandy, clay and mixed soils during 1992. Pythium, Rhizoctonia, and Thielaviopsis were active in all three tests. The most effective treatment was Nu-Flow ND + Apron TL + Weco 62864 with both high seedling emergence and excellent root disease ratings. Second was Vitavaz PCNB + Apron + Baytan + Terraclor TSX (infurrow) with moderate seedling emergence and excellent root disease ratings. A second test of 12 seed treatments across, high medium and low seed qualities had three replications in wheat stubble and three in clean till. Emergence was significantly different among the seed qualities with 60, 41, and 34 percent emergence with high, medium and low seed qualities respectively. Emergence in the clean till was 54% and the wheat stubble was 36%. 1992 results confirmed earlier findings that high seed quality would provide better emergence of healthy seedlings verified the reports of others that seedling disease will increase in wheat stubble and introduced a new experimental fungicide, Weco 62864, that shows great promise for controlling black root rot.



Reprinted from 1993 Proceedings Beltwide Cotton Conferences pg. 222
©National Cotton Council, Memphis TN

[Main TOC] | [TOC] | [TOC by Section] | [Search] | [Help]
Previous Page [Previous] [Next] Next Page
 
Document last modified Sunday, Dec 6 1998