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荸荠秆枯病是影响荸荠产量的主要病害，一般发病率为5％～40％，重者达100％，造成荠秆大量死亡．地下部结荠很小，甚至不结荠，当病秆率达50％以上时，可使荸荠减产70％以上。一、危害症状该病可危害叶鞘、荠秆和花器。首先在基部叶鞘上发病，产生水渍状暗绿色小斑，逐渐扩展?
Water chestnut stem blight is a major disease affecting the yield of water chestnuts, the general incidence of 5% to 40%, the weight of up to 100%, resulting in a large number of water chestnut died. Ground water chestnut is very small, not even water chestnuts, when the stalk rate of 50% or more, the water chestnuts can cut more than 70%. First, the harm symptoms The disease can endanger the sheath, chestnut stalks and flowers. The first incidence in the basal leaf sheath, resulting in water-like dark green patches, gradually expanding?