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一、基本情况苹果树腐烂病是一种毁灭性的枝干病害,我们果园曾遭到了严重为害,损失很大,尤以一号园为甚。这块果园共有1400株结果树,1968年前,发病较轻,树冠完整,历年产量约在20万斤上下。但从1968年以后,病情日趋严重,产量大减。据1975年调查,全株病死的有59株,因病锯掉大型骨干枝(指大主枝),其枝量相当于211株完整的大树。死树和不同程度缺主枝的株数,八年中损失占27%(如表1)。由于腐烂病的严重为害,使这个果园处于毁灭状态。
First, the basic situation Apple tree rot disease is a devastating branch disease, our orchard has been seriously harmed, a great loss, especially in the first park is even worse. This piece of orchard a total of 1400 tree results, before 1968, the incidence of lighter, complete crown, the annual output of about 200,000 pounds in the upper and lower. However, from 1968 onwards, the condition became more and more serious and the output dropped drastically. According to a survey conducted in 1975, 59 strains of whole plant died of disease, sawing large-sized backbone branches (referring to the main branch) due to illness, and the amount of branches was equivalent to 211 complete large trees. The dead trees and the number of the main lack of branches, the loss of eight years accounted for 27% (Table 1). The orchard is in a state of destruction because of the serious detritus.