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许多农户问到一个这样的问题,每年我们种植的大葱在买苗子的时候就发现大葱叶部有白色斑点,种植后有的白斑逐渐扩大并细密连片,甚至叶尖干枯,严重时叶部下垂扭曲,变黄枯萎,致使叶部不能食用,对大葱产量和品质影响极大,即农民所说的“越长越小”。我
Many peasants ask one such question every year when we grow green onions and buy seedlings, we find white spots on the leaves of some green onions. After planting, some white spots gradually expand and are closely contiguous. Twisted, yellowing and withered, resulting in leaves can not eat, great impact on the yield and quality of the shallots, that is, farmers said “the longer the smaller ”. I