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西瓜果实腐斑病也称西瓜水渍病、西瓜细菌斑点病或果实烂皮病,是一种毁灭性细菌病害。主要为害西瓜的果实,幼苗及叶片也可被害。 一、症状 1.开始发病时,在果实表面出现许多玉米粒大小的水浸状暗绿色小斑点,斑点不凸也不凹,以后迅速发展扩大为边缘不规则的深绿色水渍状大斑,像开水烫了似的,病部发硬。病轻尚可食用,病重则果实腐烂。 2.病斑多发生在果实的上表面,以后果实表面开裂,可造成果实腐烂。 3.叶部病斑初在叶背面为水浸状斑点,并带有黄色晕圈的小点。幼苗被害后叶导致叶片干枯,幼苗死亡。 二、防治方法 1.选用抗病品种,并进行种子消毒。用福尔马林100倍液浸种30分钟,或用次氯酸钠300倍液,
Watermelon fruit rot spot disease, also known as watermelon water stain disease, watermelon bacterial spot disease or rotten skin disease, is a devastating bacterial disease. The main damage to the fruits of watermelon, seedlings and leaves can also be victims. First, the symptoms 1. When the onset, the appearance of many corn kernels in the surface of the size of the flooding-like dark green spots, the spots are not convex nor concave, the rapid development after the expansion to the edge of the irregular dark green water-like spots, Like water boiled, ill hair hard. Sick but still edible, sick, rotten fruit. 2. Lesions occur in the upper surface of the fruit, after the fruit surface cracking, can cause fruit decay. 3. leaf lesions at the beginning of the leaves back to the flooded spots, and with yellow halo of the dots. After the seedlings killed the leaves lead to leaf dryness, seedling death. Second, control methods 1 selection of resistant varieties, and seed disinfection. Soaking with formalin 100 times for 30 minutes, or sodium hypochlorite 300 times,