我县有结果期大梨树118万株,1987年产果65万吨,占我县水果总产量的55％左右。过去梨树腐烂病虽然普遍发生,但多数发病只限于表皮,病部不治即可自愈。最后病皮翘起,病皮下形成新皮层,很少有死枝现象。而1987 In the county, there are 1.18 million large pear trees with a fruit yield of 650,000 tons in 1987, accounting for about 55% of the total fruit output of our county. Pear rot disease in the past although the prevalence, but most of the incidence is limited to the epidermis, diseased parts can be self-healing. The last skin upturned, the disease under the skin to form a new cortex, there are few dead branches phenomenon. And 1987