Sclerotinia Rot of Pears in Oregon

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Abstract
Record rainfall occurred in the Hood River Valley during spring of 1993. In late spring, lesions up to 2 cm in diameter were observed on d'Anjou pear pear fruitlets on the calyx end or where senescent flower parts adhered to the fruits. Sclerotinia sclerotiorum was consistently isolated from infected tissue. Koch's postulates were tested, and S. sclerotiorum was confirmed as the cause of the disease. Mycelial growth of the pathogen on acidified potato dextrose afar was optimum at 20 degrees C, and the average growth rate was about 10 mm per day. Five pear cultivars were ranked in order of increasing resistance to Sclerotinia rot as follows: d'Anjou, Bosc, Columbia Red d'Anjou, Bartlett, and Comice. Among eight fungicides tested, only iprodione provided good control of fruit infection.

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