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1989年春,辽宁省营口县苹果幼树普遍发生抽条。据全县13个乡、场调查,共有苹果树1689163株,其中215122株发生抽条,占总数的12.7％。抽条植株中,有79085株整株抽死,占总株数的4.7％。一、抽条原因:抽条的时间多数在3月
The spring of 1989, Yingkou County, Liaoning Province, apple saplings commonly occur pumping. According to the survey of 13 townships in the county, a total of 1,689,163 apple trees were found, of which 215,122 were spores, accounting for 12.7% of the total. In the drawn plants, there are 79085 whole plant drawn death, accounting for 4.7% of the total number of plants. First, pumping reasons: the majority of pumping time in March