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Home Publications National Nursery Proceedings 1978 Fungicidal tolerance of botrytis cinera

Fungicidal tolerance of botrytis cinera

Numerous Botrytis cinerea isolates from containerized conifers within 3 Colorado nurseries exhibited levels of tolerance to commercially-used fungicides. Some isolates were tolerant to benomyl, captan, chlorothalonil, mancozeb, and zineb during in vitro growth tests on agar medium. Dichloran was the only fungicide that was completely inhibitory to all isolates tested. Benomyl at 50 ppm did not inhibit conidial germination on agar, although germ tube growth of sensitive isolates was restricted. These results indicate that B. cinerea isolates have developed tolerance to many commercial fungicides. Pres- c ptions for fungicide application should be based on tolerance characteristics of isolates present.

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Author(s): L. S. Gillman, Robert L. James

Publication: National Nursery Proceedings - 1978

Event: Nurseryman's conference and seed processing workshop
1978 - Eureka, CA