How to identify the three major diseases of Chinese cabbage? The three major diseases of Chinese cabbage are cabbage virus disease, downy mildew and soft rot. (1) Symptoms of Chinese Cabbage Viral Disease: 1 The onset of disease at the seedling stage begins with clear veins appearing from the heart and veins, chlorosis along the veins, resulting in light green and dark green mottled leaves, leaf shrinkage, and severe disease seedling dwarfing leading to death. . 2 adult stage disease, early onset of heavy plant disease, severe leaf shrinkage, hard and brittle, often many small brown spots, the main veins on the back of the main vein brown slightly depressed necrosis short rose, plant obvious dwarfing, Deformity, generally can not be ball. In the late-staged planting, some of the animals were half-sided, with some shrinkage and malformation, and some of them were ball-bearing. Some of the deformed dwarfs were lighter, and some showed only mild mosaics and shrivelings. The heart is not tight, there are many brown spots on the inner leaves. 3 Disease-inducing strains were planted in late spring and the serious diseased plants died immediately before convulsions. The peduncle of the diseased plant often suffered from crooked deformity and dwarf plants. The new leaves exhibited bright veins and mosaic symptoms, and the old leaves had brown necrotic spots. The buds were not well developed. Some petal malformations are leafy, with no scars or thin, small, strong seeds, and low germination rate. (2) Symptoms of Downy mildew in Chinese cabbage: Diseases occur from the seedling stage to the flowering stage and the scab stage, but they are the most affected by adult plants. 1 Seedlings suffer from damage. On the back of the leaves, a layer of mildew and mildew is found on the back of the leaves. There are no obvious symptoms on the positive side. The severely ill seedlings turn yellow and cause death. 2 victims of adult disease, the general outer leaves first disease, gradually expanding to the inner layer; from sporadic disease to the general incidence of all fields. Leaf disease on the front of the leaf shows the appearance of white frost on the back of the macula, which is the sporangia of the pathogen. When the disease is severe, the mold layer covers the entire leaf. In the end, the diseased part is yellow-brown to dark brown and dry and dead. 3 In stems, pedicels and seed pods, the medullary cells and cortical cells of the diseased part grow too much by being stimulated by pathogenic bacteria, and they become fat or deformed, commonly known as “head diseaseâ€. In wet conditions, the diseased part also produces white frosty mildew. The pods are curved and the grain is not full. (3) Symptoms of soft rot in Chinese cabbage: 1 The disease mainly occurs after Chinese cabbage is wrapped. In general, the wounds at the base of the vegetables invade into the infiltrating area of ​​the immersed water and gradually expand into pale grayish brown. The tissue is sticky, soft and rot-like, and will be accompanied by a foul odor called "rotten cucurbit" or "rotten". pimple". The diseased part can develop from the leaf base to the root embryo, causing the barn to rot and the outer leaves to wilt after sunrise. The wilt leaves cannot recover with the development of the disease, and the plants are dumped, and the disease department loses water and shrinks. Diseases generally develop in parenchyma, and sometimes they can also enter vascular bundles and spread through the stems and veins to the whole plant; plants with light disease, the pathogens lurk in the tissues, and cause rotting kiln during storage period. 2 Chinese cabbage leaves suffer damage. Early onset can cause the whole plant to rot, and late onset often causes deficiencies due to shortening stem rot without twitching and even dies in the middle.
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