Chinese cabbage black shank is a common disease during the cultivation of Chinese cabbage, which can occur from the seedling stage to the adult stage. On the onset of seedlings, there were pale brown lesions on the cotyledons and true leaves, which turned grayish white; the diseased stems developed lesions with long and slightly concave spots, and the edges of the lesions were purple. In the rosette stage, the typical symptoms are near-circular or oblong lesions in the outer leaves. The initial dark brown color is grayish white, the lesions are slightly concave, the outer edge has a purple halo, and the upper black dots are cut open. The root of the disease, the vascular bundle turns black, the roots and shortened stems of the diseased plant are hollow and decaying, and often the part is broken or not mature until it dies; after planting the disease, the stem is dark brown dry rot, which is not good; the storage period can also be infected, the pathogen Can cause dry rot of the blade.
Chinese cabbage is planted densely, and the plants and rows are stagnation. The ventilation and light transmission are not good, and the incidence is heavy. However, excessive application of nitrogen fertilizer leads to excessive growth or insufficient fertility, which may cause the disease to be reduced. The soil is sticky, acid, and heavy for many years. There are many diseased bodies in the field, extensive cultivation, and weedy fields, which have reduced plant resistance and serious disease. Seed-borne bacteria, fertilizers are not fully decomposed, organic fertilizers or fertilizers are mixed with the disease of the undergraduate crops. The terrain is low in stagnant water, poor drainage, and the soil is prone to disease, especially in the nursery period, the humidity is very high, and the weather is humid and rainy after the planting or high temperature after the rain. Linyi Fertilizer Network Copyright
Prevention and treatment method: Linyi Fertilizer Network Copyright
First, the agricultural measures use high-altitude fields for deep sorghum cultivation. Before sowing or transplanting, remove the weeds in the field and surrounding areas; deepen the ground to eliminate mites, promote the decomposition of the diseased bodies, reduce the source of the disease and the source of insects. It is best to carry out crop rotations. Linyi Fertilizer Network Copyright
Second, seed disinfection seed dressing with a seed weight of 0.4% of 50% acacia copper WP or 50% thiram double wettable powder. Linyi Fertilizer Network Copyright
Third, the seedbed disinfection seedbed is mixed with 40% mixed seedling powder 8g/m2 and 40% Fumei double wettable powder, and then mixed into 40kg of fine soil to form a medicinal soil. On the surface, the remaining part of the soil is covered on the seed after sowing. Linyi Fertilizer Network Copyright
Fourth, in the early stage of spray control, 60% more blister powder 600 times solution or 40% more sulfur suspension agent 500-600 times solution, 50% procymidone WP 1000 times solution, 72% sulfuric acid Streptomycin or neomycin WP 4000 times solution, 47% Chunlei oxychloride copper wettable powder 800 ~ 1000 times liquid, 20% thiabacter copper suspension 500 ~ 600 times liquid, 70% methyl thiobacteria The WP can be sprayed and treated with 800 to 1000 times of liquid, sprayed once every 7 to 10 days, for 2 to 3 times. Linyi Fertilizer Network Copyright
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