Abstract
Naturally infected plum leaves were collected during Aug. and Sept. 1994 to evaluated for the presence of Xylella fastidiosa, the causal agent of plum leaf scald (PLS). Leaves were from trees at least 4 years old in variety trials at four locations in Alabama. ELISA tests for X. fastidiosa were used to determine the presence of the organism in infected trees. The symptoms also were evaluated with a rating index for PLS. Some plum cultivars (i.e., `AU-Producer', `Morris', `Explorer', and `AU-Cherry') showed high tolerance to PLS. Both ELISA tests and visual observation indicated that an Auburn Univ. seedling (CD-l 22) was free from this disease. PLS infection was lower in North Alabama compared to Central Alabama.
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