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湖北襄阳县雷海平问:1999年我调整产业结构,种了1300平方米巨森苹果。可是去年树苗开始染病死亡,症状是:树根部到干基部褐变、腐烂,有白色菌丝,而后枝叶干枯,树枝枯死。树体发病一般在7月下旬～8月。至今已死了40多棵。我也采取过措施,比如休眠期用石灰拌石硫合剂刷白树干,用代森锰锌、甲基托布津杀菌,今年又用“绿风95”消毒杀菌,均不见起色。请帮我解决这个难题。如果在缺掉苹果树的地方补栽上甜橙树,不知是否能行?
Lei Haiping, Xiangyang County, Hubei Q: In 1999, I adjusted the industrial structure and planted 1,300 square meters of giant apple. However, the saplings began to die of the disease last year. Symptoms are that the roots of the trees are brown and decay, with white mycelium. The branches and leaves are then withered and the branches are dead. Tree disease is generally late in July ~ August. So far dead more than 40 trees. I have also taken measures, such as dormant lime stone lime sulfur mixture brush white trunk, with mancozeb, thiophanate-methyl sterilization, this year with “Green Wind 95” disinfection and sterilization, are not seen improvement. Please help me solve this problem. If the absence of apple trees in the replanting of the orange tree, I do not know whether it can do?