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Effect of Cotton Pathogens on Disease Symptoms And Yield of Cotton Varieties in Large Plot Field Trials

T. A. Wheeler and J. R. Gannaway


Large plot variety tests were conducted at seven sites with histories of soil-borne diseases in the High Plains of Texas. In a site which was infested with Phymatotrichum omnivorum (cotton root rot), no varietal differences occurred for the incidence of dead plants, and the highest yielding varieties were Tamcot 'Sphinx' and All-Tex 'Atlas'. In a site with Fusarium wilt and Meloidogyne incognita (root-knot nematode), yield was correlated with an interaction between root-knot nematode density and incidence of wilt. The highest yielding variety was Paymaster 'HS26'. In a site with Fusarium wilt, root-knot nematode, and seedling disease (Rhizoctonia solani and Pythium), yield was correlated with all three factors, including an interaction between seedling disease and root-knot nematode. The highest yielding varieties were Stoneville 887 and Paymaster '330'. Verticillium wilt was not a serious problem in 1997, and in one of three fields selected for this disease, wilt was correlated with yield. All-Tex Atlas was either the first or second ranked variety in all three of these wilt sites. In a site where no disease occurred, no yield differences in the varieties were seen. Varietal tolerance or resistance to root-knot nematode, Fusarium and Verticillium wilts, and seedling diseases was observed.

Reprinted from Proceedings of the 1998 Beltwide Cotton Conferences pp. 165 - 168
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998