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Survival of Colletotrichum coccodes in Soil. J. D. Farley, Associate Professor, Ohio Agricultural Research and Development Center, Wooster 44691, and The Ohio State University, Columbus 43210; Phytopathology 66:640-641. Accepted for publication 15 December 1975. DOI: 10.1094/Phyto-66-640.

By using a selective medium, the survival of conidia and sclerotia of Colletotrichum coccodes was studied in an artificially infested soil incubated either moist or dry at 4 C or 25 C for 52 weeks. Survival also was studied in soils incubated at 25 C in which the moisture level was continuously varied. When sclerotia were used as an inoculum, a decrease in populations was detected after 52 weeks in dry or moist soil incubated at 4 C or 25 C or in soil incubated at 25 C where moisture varied. Conidia populations were reduced in the first week by 89-96% in dry soil and 28-45% in moist soil with the less rapid population decline in the soil incubated at 4 C. After 52 weeks, conidia populations were reduced by 96-99% in all treatments.

Additional keywords: tomato anthracnose.