Association ofPhytophthora syringaewith Pruning Wound Cankers of Almond Trees

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Abstract
Cankers on almond trees with profuse gumming associated with pruning wounds were frequently observed in California [USA] orchards during the winters and springs of 1982-1984. These cankers frequently girdled and killed limbs less than 5 cm in diameter. P. syringae was isolated with high frequency from these cankers in April, but not in June, and its pathogenicity to pruning wounds was proved by artificial inoculations in Feb. Nearly all cankers caused by P. syringae were associated with pruning wounds or injuries created during pruning in late autumn and winter. No other known pathogens of almond were isolated from pruning wound cankers. Excised branch pieces inoculated with P. syringae developed cankers at temperatures between 2.degree. and 20.degree. C.

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