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我场苹果根腐病从一九六五年就已开始发生,由于“四人邦”的干扰破坏,防治工作长期以来未正常进行。一九七七年十月调查10,833株苹果树中,根部腐烂已死和正受危害的有682株,占总株数的百分之五点二。受危害的树大部份都是成年树,产量由一九七五年的四十二万多斤下降到一九七七年的三十二万多斤,造成了严重的损失。打倒了“四人邦”,科研工作大解放,一九七七年,我场苹果根腐病开始了研究和
My apple root rot has started to take place in 1965. As a result of the “gang of four” interference and disruption, prevention and control work has not proceeded normally for a long time. In October, 2007, of the 10,833 apple trees surveyed, 682 were dead and were at risk of being rooted, accounting for 5.2% of the total number of trees. Most of the harms of the trees were adult trees. Their output dropped from 420,000 kilos in 1975 to more than 320,000 kilos in 1977, causing serious losses. Down with the “gang of four,” the great liberation of scientific research. In 1977, my field of apple root rot began research and