What are the diseases of Ban Langen and how are they identified?

The Banlangen mainly has the following 4 kinds of diseases:
First, downy mildew. The lower leaves of the plant first attack and the upper leaves spread. There was an off-white, frosty mildew on the back of the leaves, and there were no obvious lesions on the leaves. The victim part develops into a green round spot and becomes a brown spot afterwards. In severe cases, the brown spot grows into a large spot, and the edge of the diseased leaf also becomes brown and dry until the entire leaf is dry and dead. Prevention and control measures: (1) Remove sick leaves after harvest and concentrate treatment; (2) Pay attention to drainage and ventilation, light and reasonable planting, and reduce humidity; (3) Spray at the beginning of onset, available 1:100-150 times Bordeaux mixture or 65% dexamethasone 500 Doubling, or spraying 25% of Rhizoctonia WP 1000 times. Pay attention to the spraying of leaves.
Second, gray spot disease. A small lesion appeared on the diseased leaf, which was 2-6 mm in diameter, grayish in the middle, brown on the edge, thin and easily perforated. At the late onset, lesions continued to grow throughout the entire leaf until death. A mildew layer appears on the front of the blade when wet. The control measures are the same as downy mildew.
Third, root rot. The roots of the fibrous roots and the roots of the roots were first victimized, dark brown, and brown to the root vascular bundles. In the later period, the whole roots were rotted and the plants on the ground were wilting and gradually withered. Control measures: (1) rotation; (2) selection of well-drained sandy loam soil; (3) 50% carbendazim or thiophanate-1000-fold irrigation at the beginning of onset.
Fourth, Sclerotinia disease. Roots, stems and pods are all affected. The leaf was initially immersed in a dark-brown lesion, and the entire leaf was rotted, leaving only the veins. When the stem was damaged, the cortex rotted and the stalk was broken into a mess. It was covered with hyphae. There were black murine sac sclerotia in the inside and outside of the stem and in the leaves. The sclerotia were the most common at the base of the stem. In the later period, the whole plant withered and died yellow. Control measures: (1) paddy-upland rotation; (2) field drainage in the rainy season; reasonable close planting, ventilation and light transmission; (3) spraying 65% zeocin zinc 600 times solution or thiophanate-methyl 1000 times solution in the early stage of disease onset.

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