Peanut planting high-yield technology, how to do leaf spot disease in peanuts?
Peanut planting high-yield technology How do peanut leaf spot disease occur ? Peanut leaf spot is dominated by black spot and brown spot, and both diseases are dominated by harmful leaves. When peanuts develop, symptoms begin to appear from the lower leaves, and then gradually spread to the upper leaves. In the early stage of the disease, brown spots are produced, which gradually develop into round or irregular lesions. Brown spot disease lesions are large, there are yellow halos around the lesions, while black spot disease lesions are smaller, the color is lighter than brown spot disease, the edges are neat, and there is no obvious halo.
The weather is wet or long-term rainy, the lesions can be combined into irregular large spots, and the leaves are scorched, which seriously affects photosynthesis. If it occurs on the petiole, stem or fruit needle, it will produce an elliptical dark brown or brown lesion, but the whole stem or fruit needle will be black and dead, which will greatly reduce the peanut yield.
Peanut planting high-yield technology How do peanut leaf spot disease occur ? Control method
Eliminate the pathogenic bacteria and remove the residual pathogens in the remaining fields in time after the peanuts are harvested. Do not throw them away or pile them up. The plots with pathogen residues should be ploughed in time to accelerate the decomposition of the pathogen residues and prevent the bacteria from infecting the peanuts.
The selection of resistant varieties is more resistant to disease, such as erect growth, thick leaves, deep color, large peanut varieties or early-maturing varieties. In areas with heavier onset, these varieties can be planted, such as 冀花2, Lu Spend 14 and so on.
Strengthen cultivation management, timely sowing, reasonable close planting, applying sufficient base fertilizer, timely topdressing, promoting healthy growth of peanuts and improving disease resistance.
The prevention and treatment of chemical agents in the early stage of the disease can reduce the disease. A better agent: 80% of mancozeb 400 times solution, 70% of methyl thiophanate 1000-1500 times solution, 50% of carbendazim 1000-1500 solution. When spraying, pay attention to spray and spray, spray once every 7 to 10 days, and even spray 2 or 3 times to basically control the occurrence of the disease.
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