过去,对苹果树腐烂病一直是采用刮治的办法,虽然也收到一定的效果,但是,年年刮治,年年有大量的新病发生。1973年到1976年,我所开展了重刮皮预防病害的研究,取得了发病率从80%降低到1—3%的防病效果。一、重刮皮的由来我们通过观察发现,不同树龄的苹果树,树 In the past, apple tree rot disease has always been a cure, although it also received a certain effect, however, scraping every year, a large number of new diseases occur every year. From 1973 to 1976, I carried out research on the prevention of severe skin peel disease and achieved the preventive effect of reducing the incidence from 80% to 1-3%. First, the origin of heavy scrape We found through observation that different ages of apple trees, trees