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我县西瓜的种植初具规模,西瓜连作在我县较为普遍,导致西瓜枯萎病逐年加重,常在很短的时间内造成西瓜蔓整株整垄萎焉焦枯。特别在高温多雨年份,发病早、快、重,严重威胁西瓜的产量。1、主要症状发病初期叶片从后向前逐渐萎焉,似缺水状,中午尤为明显,但早晚可恢复,3-6天后,整株叶片枯萎下垂,不能复原。茎蔓基部缢缩,有的病部出现褐色病斑或琥珀色胶状物,病根变褐色腐烂,茎基部纵裂,病茎纵切面上维管束变褐。湿度大时
Watermelon cultivation in our county has begun to take shape, with watermelon even more common in our county, leading to watermelon wilt year by year aggravating, often in a very short period of time caused by watermelon whole plant whole crop Yan Lang coke dry. Especially in hot and rainy years, the incidence of early, fast, heavy, a serious threat to watermelon production. 1, the main symptoms of early onset gradually wilting from the back to the leaves, like water shortages, especially at noon, but sooner or later to resume, 3-6 days after the whole plant withered leaves withered, can not be restored. Stalk creeping basal constriction, and some disease spots appear brown spots or amber jelly, diseased roots turn brown rot, stem longitudinal crack, sickness longitudinal section of the vascular bundle brown. When humidity is high