Carrot spot blight is a common disease of carrots. Some people may not know very much about the occurrence of carrot spot blight. Therefore, Xiaobian today mainly introduces the occurrence of carrot spot blight and prevention methods. .
The pathogen of carrot spot blight is scattered with the diseased body and the winter in the soil, and the seeds can also carry bacteria, which are the primary infestation sources. The conidia of the disease pathogens absorb the conidia after water absorption, spread by wind and rain and irrigation water, and invade through the pores or penetrate the epidermis. The disease is reinfected frequently and the disease develops rapidly. The pathogens are warm and wet. In particular, management is extensive, and the incidence of growth and decline is the heaviest. The lesions on the diseased leaves are irregular or nearly circular, and the boundary between the diseased and healthy tissues is clear. The edges of the lesions are yellow-green, central brown or dark brown. The small black particles on the lesions are buried, or the small particles are buried or semi-buried. On the surface, irregularly shaped lesions with dark brown and slightly concave are formed, and black small particles are scattered on the lesions. When the disease is serious, the leaves are covered with lesions or lesions, which leads to early yellow leaves.
Pesticide control measures for carrot spot blight: 70% mancozeb WP 500 times solution or 80% Xinwansheng WP 600 times solution or 40% Dafudan WP can be used every 666.7 square meters at the beginning of the disease 500 times solution, or 40% polysulfur suspension 500 times solution, or 77% can kill 800 times solution of wettable microparticle powder, or 1:1:160-200 Bordeaux mixture 50-60 kg alternate spray, every 7-10 Once a day, even spraying 2 to 3 times, the control effect is good.
Carrot spot blight, also known as leaf spot disease. Its occurrence is a great threat to carrots, so it is necessary to take certain preventive measures.
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