日本静岗县的西瓜主要产地在箱根山麓、远洲海岸及西部洪积地带。据称,一九七八年在103公顷面积上获得了25300吨的产量。近年来,各地普遍发生了原因不明的西瓜急性凋萎病,现将该病症状及防治方法叙述于下。一、田间发病情况调查为避免西瓜蔓割病的为害.各产区以往习惯采用瓠子做西瓜的砧木。但从1945年下半年开始观察 The main origin of watermelon in Japan Jinggang County in Hakone foothills, far Island coast and western alluvial zone. It is said that in 1978, 25300 tons of production was obtained on 103 hectares of land. In recent years, the unidentified wilt disease of watermelon has occurred in different parts of the world, and the symptoms and prevention methods of the disease are described below. First, the incidence of the field investigation To prevent watermelon disease-borne disease.Pre-production areas used to do prickly ash seedlings. But from the second half of 1945 began to observe