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Conservation Tillage and Seedling Diseases in Cotton and Soybean Double-Cropped with Triticale. DONALD R. SUMNER, Department of Plant Pathology, University of Georgia, Tifton; CLYDE C. DOWLER. A. W. JOHNSON, Nematodes, Weeds, and Crops Research Unit, USDA/ARS, Tifton, GA; and SHELBY H. BAKER, Department of Crop and Soil Science, University of Georgia, Coastal Plain Experiment Station, Tifton 31793-0748. Plant Dis. 79:372-375. Accepted for publication 15 December 1994. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source The American Phytopathological Society, 1995. DOI: 10.1094/PD-79-0372.

A double-crop rotation of cotton-triticale-soybean-triticale was grown for 4-5 yr in three experi-ments on loamy sand soil. Tillage treatments were conventional (moldboard plowing 20-25 cm deep after burning triticale residues), no-till, row-till, and ridge-plant. Triticale residues were managed by burning or cutting the straw short (20 cm) or tall (60 cm) at harvest. Population densities of Rhizoclonia solani anastomosis group (AG)-4 in soil after triticale were low to moderate and similar among treatments. Population densities of Pythium spp. in soil were high and variable among treatments. Root and hypocotyl disease severity in cotton and soybean seedlings was low to moderate each year. In most years and crops, tillage and residue management treatments did not influence seedling disease or inoculum densities of pathogens. When there were differences, burning triticale residues and moldboard plowing improved seedling health