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孢子囊是无色的，单束或2-4束，从气孔突出，上部的急性角度为3-5次，并且在分支的末端生长孢子囊； the sporocyst is ovate or lemon-shaped, with milky protrusions at the top, single cells, and light brown. The pathogen of cucumber downy mildew is Cuban fake downy mildew. Sporangia可以发芽和生长出萌芽的管子，或释放动物孢子，变成圆形的孢子，发芽发芽管并入侵宿主。 Ooospores are spherical, yellow, with tumor-like protrusions on the surface. Downy mildew mainly harms leaves.幼苗发掘出来后，子叶将被感染，显得淡淡的绿色和不规则的斑点，并逐渐变成淡黄色的棕色。 If the leaves are infected, water-like irregular spots appear on the edges or backs of the leaves.随着疾病的发展，患病区域将逐渐消失并变成黄褐色。 Because the development of the lesions is restricted by the leaf veins, it becomes polygonal.当早晨露水不干时，病变的周围区域是深绿色的，类似水，并且病变的背面有黑色霉菌层。 When the condition is serious, the lesions are connected to each other and the diseased leaves die.