In Vitro Reactions ofCladosporium caryigenumwith Pecan Condensed Tannins and Isoquercitrin

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Abstract
In vitro growth of Cladosporium caryigenum, the pecan scab incitant, was significantly inhibited by condensed tannin and isoquercitrin, allelochemicals that had been extracted from freeze-dried pecan leaves (Carya illinoensis cv. Van Deman). Nine isolates of C. caryigenum varied in their responses to condensed tannin at a concentration of 4,000 .mu.g/ml. Even the most tolerant isolate was inhibited at concentrations of 4,000 .mu.g/ml and above. Isoquercitrin at 4,000 .mu.g/ml was about two to four times more inhibitory than tannin to growth of three isolates of C. caryigenum, and differences were found in the tolerance of the three isolates to isoquercitrin.