西葫芦细菌性叶枯病在保护地发生重于露地。近年来,该病随种子传播,发病范围不断扩大。由于菜农常误认为是真菌性病害,用药不对路,错过防治有利时机,造成较大损失。 一、症状 该病主要危害叶片,也可危害叶柄和茎。幼叶染病,病斑出现在叶面黄化区,但不太明显,叶背面出现水渍状小斑点,后变成黄色、圆形或近圆形小病斑,病斑中间半透明,有透光感,四周具有黄色晕圈,菌浓不明显或较少,叶面有油光感。病菌从叶缘侵入,可引起叶缘枯死。苗期 Zucchini bacterial leaf blight occurs more heavily in the protected area than in open field. In recent years, the disease spread with the seed, the scope of the disease continues to expand. As vegetable farmers mistakenly believe that it is a fungal disease, medication is wrong, missed the favorable opportunity to control, resulting in greater losses. First, the symptoms of the disease the main hazards leaves, pests and stems can also be hazardous. Young leaf disease, lesions appear in the yellow area of ​​the leaves, but not too obvious, the back of the leaves appear water-like small spots, after turning into yellow, round or nearly circular lesion, the lesion translucent, with Light perception, surrounded by a yellow halo, bacteria concentration is not obvious or less, shiny leaves a sense of the flu. Bacteria invade from the leaf margin, can cause leaves edge dead. Seedling