枯萎病是瓜类作物的主要土传病害,病原菌在土壤中积累,发病逐年加重。初发病的田块,仅见个别植株死亡,一般病田出现多个点片状发病中心,重病田几乎全部植株枯死而绝产。一、危害症状苗期和成株期都可发病,但主要在开花坐果以后陆续显症。发病初期植株下部叶片褪绿,萎蔫下垂,中午明显,早晚尚能恢复。几天以后叶片黄 Fusarium wilt is the main soil-borne diseases of melons, pathogens accumulate in the soil, the incidence increases year by year. The first incidence of plots, only to see the death of individual plants, the general emergence of multiple sites flaky disease center, severe disease almost all of the plants dead and abortion. First, the danger of symptoms Seedlings and adult stage can be disease, but mainly in the flowering after fruit show one after another. In the early stage, the leaves of the lower part of the plant became chlorotic, wilting and drooping, obviously at noon and recovering sooner or later. Leaves yellow a few days later