Effect of Composted Sewage Sludge on Several Soilborne Pathogens and Diseases

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Abstract
The effect of composted sewage sludge (compost) on several soilborne pathogens and diseases was tested in the greenhouse. Aphanomyces root rot of peas; Rhizoctonia root rot of bean, cotton and radish; Sclerotinia drop of lettuce, Fusarium wilt of cucumber; and Phytophthora crown rot of pepper were significantly decreased by addition of 10% compost to soil. Other diseases, Pythium damping-off of pea and bean, Fusarium root rot of pea, and Thielaviopsis root rot of bean and cotton were not affected or were increased by compost. Suppression of diseases caused by Pythium and Rhizoctonia spp. was enhanced by increasing the time between soil amendment and planting. Survival of S. minor, R. solani, and Pythium spp. was not decreased by the compost, but the activity of these pathogens in soil may be affected by an increase in microbial activity stimulated by addition of compost to soil.

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