Detection and Characterization of Benomyl-ResistantMonilinia laxaon Apricots

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Abstract
In 1980, M. laxa resistant to benomyl was isolated from decayed fruit and blighted twigs of apricots in California [USA]. Resistant isolates grew on Difco potato-dextrose agar (PDA) amended with 1 mg/l benomyl and 1 isolate grew at 2 mg/l benomyl. Colonies of benomyl-resistant isolates had typical scalloped margins on Difco PDA, except 2 single-spored benomyl-resistant subcultures that grew very rapidly with no scalloped margins and produced very few conidia. Conidia of 3 benomyl-resistant isolates germinated normally, but unlike the other benomyl-resistant isolates, were incapable of producing colonies on benomyl-free Difco PDA medium. A greater proportion of conidia of one of these isolates germinated and grew normally on PDA medium prepared with fresh potatoes than on media prepared with Difco PDA. Benomyl-resistant isolates failed to grow out from mycelial plugs when transferred to benomyl-free Difco PDA medium after extended exposure to 3 mg/l benomyl. Benomyl-resistant isolates produced smaller cankers than benomyl-sensitive isolates on inoculated almond shoots.

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