绥中县前卫公社西大大队果园,因腐烂病发生严重,仅一九七七年就砍掉盛果期的大树十六株。他们组织技术员对苹果腐烂病做了调查,全园还有三十六株不同程度发生了腐烂病,并发现有的病斑接触地表土壤就不往下蔓延扩大。技术员张国平受到启发,这三十六株都是主干基部发病,他把树干周围都用土培上 Suizhong avant-garde commune West Brigade Orchard, due to serious rot disease, only in 1977 to cut off the fruiting period of 16 large trees. They organized a technician to investigate the apple rot disease, and there were 36 different degrees of rot disease in the whole park. It was found that some lesion did not spread and spread under the ground surface soil. Technician Zhang Guoping inspired, these thirty-six are the main base of the disease, he used the soil around the tree culture