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桃疣皮病是我国桃树上一种新病害,主要侵害一、二年生枝条,幼年树和成年树均可受害,在皮孔部位形成疣皮症状,引起流胶,致使桃树早衰。据作者对上海市8个县15个果园普查,发病严重果园占49%,株发病率为100%;一般果园占51%,株发病率为31～49%;严重威胁着桃树生产。作者在摸清了该病病原的基础上,对该病害的流行规律及药剂防治开展了研究。现将几年来观察、研究的结果报告如下。一、流行规律(一)致病力与寄主范围桃疣皮病菌除侵染桃树一、二年生枝条外,
Peach wart disease is a new disease on peach trees in our country. It mainly affects the first and second year branches. The juvenile tree and adult tree can both suffer, forming the warts symptoms in the lenticels, causing the flow of gum and premature aging of the peach trees. According to the author’s survey of 15 orchards in 8 counties in Shanghai, the incidence of serious orchards accounted for 49%, the incidence of strains was 100%; general orchard accounted for 51%, the incidence of strains was 31 to 49%; a serious threat to peach tree production. On the basis of finding out the pathogen of the disease, the author carried out research on the epidemic law and medicament prevention and control of the disease. Now years of observation, the results of the study reported below. First, the prevalence of law (a) virulence and host range Peach warts disease in addition to peach trees infected one or two years of branches,