How to distinguish between cucumber spot and downy mildew

Different causes of different causes, low temperature and high humidity can easily cause bacterial angular leaf spot; normal temperature and high humidity can easily induce fungal downy mildew. The diseased leaves have different degrees of lightness, and the leaves of the leaf spot disease have light perception; the leaves of the downy mildew disease have no light perception. The site of the disease is different. The keratoses mainly infest the leaves and melon strips, sometimes damaging melon vines; downy mildew mainly damages the leaves. Diaper lesions and perforation are different. The lesions of the keratoderma are lighter in color, appear grayish, easily cracked in the initial stage, and form perforations; the downy mildew lesions are dark in color and appear yellow-brown in color without cracking or perforation. The characteristics of lesions on the back of the leaves are different. The lesions on the back of the leaves of the leaf spot have milky white bacilli, which are white or white powder after drying. The backside of the leaf of the downy mildew has a layer of black or purple gray mildew. The lesions are similar in shape but different in size. The lesions of the keratoderma are smaller and the dissemination rate is slower; the lesions of the downy mildew are larger, the immersion rate is faster, and the intermediate lesions are interconnected into slices. In the early morning, the leaf spot on the back of the leaf spot of the rhizoma macularis was macerated in water; the downy leaf of the leaf spot of the downy mildew was irregularly shaped on the back.

Prevention and treatment of keratoderma can be used 72% of agricultural streptomycin or 72% neophytin 4000 times, 60% of the bacteria net 800 times, 70% can kill 1000 times. For the prevention and control of downy mildew, 69% of dimethomorph may be used as a 1000-fold solution, 72% of Precedence 1000-times solution, 70% of Ansaisheng 1000-fold solution, and 68.75% of Fabili® as 1400-fold solution. .

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