西瓜枯萎病,又叫蔓割病、萎蔫病。主要症状:开始发病时,白天瓜秧萎蔫,早晚恢复,4～5天后枯死;病势缓慢时,萎蔫不明显,瓜蔓生长弱、矮化、叶色变黄,病蔓基部皮多纵裂,溢出茶黄色水,根部变褐腐烂。发病特点:在时雨时晴条件下易发病,施用氮肥偏多植椿徒长时易发病;在酸性土壤上或连作地块上易发病。防治方法:发病初期,用25％粉锈宁每亩用药5克,兑水15公斤,每隔7～10天喷一次,共喷2～3次。对 Watermelon Fusarium wilt, also known as vineyards, wilt disease. Main symptoms: When the onset of the disease, the melon seedlings wilting day and night, sooner or later recovery, 4 to 5 days after the dead; slow disease, wilting is not obvious, melon growth weak, dwarf, leaf color yellow, Spilled tea yellow water, brown roots rot. Incidence of disease: when the rainy weather conditions prone to disease, the application of nitrogen fertilizer partial planting Chun-prone long-term onset; in acidic soil or even on the plots prone disease. Prevention and treatment methods: early onset, with 25% triamcinolone per acre medication 5 grams, watered 15 kg, spray every 7 to 10 days, a total of 2 to 3 times spray. Correct