Strawberry Anthracnose: Detection and Survival of Colletotrichum acutatum in Soil

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Abstract
Propagules of Colletotrichum acutatum were detected in soil from a recently fallowed strawberry nursery plot. A survey of strawberry nursery and production fields showed that C. acutatum was present in soils from sites with a recent history of strawbery anthracnose but not in fumigated soils. Isolates of C. acutatum from soil were culturally similar to isolates from plant tissue and were equally pathogenic in assays using detached fruit. Soil naturally infested with C. acutatum initiated disease development on strawberry plants in the greenhouse. C. acutatum survived in buried strawberry tissue for 9 mo, but soil population densities gradually declined over an 11-mo period. Results suggest that soilborne propagules, especially those in soil attached to planting stock, may be a source of inoculum in California [USA].

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