西瓜三大病害的识别与防治

• 出 处: 农村实用技术与信息
• 发表日期: 1998年02期
• 关键词: 蔓割病 同心轮纹 农业措施 上生 预防为主 僵病 风肉 病菌传播 脚须 大皿

在西瓜生产上,经常发生炭疽病、蔓割病和疫病,三大病害一旦发生很难防治.因此,必须坚持“农业措施先行,预防为主”的方针.1.炭疽病 是危害西瓜最严重的一种病害,叶、蔓和果实都可出现病斑.叶上病斑初呈黄白色圆形或不规则形,以后变成褐色或黑色,有同心轮纹,容易干枯裂开,病斑增多,使叶片逐渐枯萎;蔓上生暗褐色

In the production of watermelon, there are frequent anthrax, spore and disease epidemic, the three major diseases in the event of difficult to prevent and cure.Therefore, we must adhere to the “agricultural measures first, the main prevention.” Anthracnose is the worst endangering watermelon Of the disease, leaf, vine and fruit lesions can be spotted on the leaf lesions initially yellowish white round or irregular shape, later turned brown or black, with concentric ring pattern, easy to dry cracked, lesions Increase, so that the leaves gradually wither;