Abstract
Root and shoot segments from Lisbon lemon trees established on sour orange, rough lemon, and volkamer lemon rootstocks were evaluated for seasonal changes in susceptibility to Phytophthora citrophthora and P. parasitica. Plant material was wounded, inoculated with P. citrophthora or P. parasitica, then incubated in moist chambers. Root segments of sour orange, rough lemon, and volkamer lemon inoculated with P. citrophthora developed shorter lesions during January-February than during July-October. Similarly, lesions on excised root tissue of sour orange inoculated with P. parasitica were shorter during January-February than during July-December
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