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Large Plot Performance of Seedling Disease Seed Treatment Fungicides

H. Kaufman, T. Wheeler, R. Graves, G. Schuster, P. Kidd and K. Siders


The value of cotton seed treatment fungicides in the low input production system of the High Plains of Texas was evaluated at five sites in both 1996 and 1997. Four superior seed treatments which included a broad spectrum fungicide (either Captan or Thiram), a material active against Pythium (Apron Fl, Apron TL, or Apron XL), and a material active against Rhizoctonia solani and Thielaviopsis basicola (Baytan 30 or Nuflow M) were compared each year with Captan alone. Plot size ranged from 0.4 to 0.8 acres with 3-4 replications in a RCBD. Disease pressure was low in 1996, due to very warm, dry conditions after planting. Plant stand and root necrosis were significantly improved by the use of superior seed treatments compared with Captan alone at 1 of the 5 sites (R. solani was present). Yields were not significantly impacted by seed treatments at any sites in 1996. In 1997, black root rot (T. basicola) was a problem at 2 of 5 sites. The use of superior seed treatments reduced root necrosis by an average of 49 % and increased yields by an average of 11 % in a field where root necrosis in Captan alone treated seed was 30 %. In another field where the average root necrosis with Captan alone was 46 %, root necrosis was reduced by 35 % and yield was increased by 12 % with a high rate of Baytan 30 (1 oz/100 lb seed). The 1 oz rate of Baytan 30 had significantly higher yields in this field with high pressure from T. basicola, than the 0.5 oz rate. Yield increases were found in fields with moderate or high levels of black root rot when using superior seed treatments which included Baytan 30 or Nuflow M. Superior seed treatments positively impacted plant stand, root health and yield when seedling disease occurred as compared to a minimal seed treatment.

Reprinted from Proceedings of the 1998 Beltwide Cotton Conferences pp. 149 - 152
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998