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灰斑病是杨树的主要病害。我们自1985—1988年,以小黑杨人工幼林为研究对象,对灰斑病侵染期、发生期、发病强度进行了研究,确定了病害的初次侵染期,建立了病害发生期及发病强度的预测预报数学模型。
Gray leaf spot is the main disease of poplar. From 1985 to 1988, we studied the infection period, occurrence and intensity of gray spot disease in the young Populus simonii plantations, and determined the initial infection period of the disease and established the disease occurrence and onset Intensity Prediction Mathematical Model.