Carrot spot blight, also known as leaf spot disease. In the autumn, the carrots cultivated in the open field usually begin to develop in the early winter. If the control is not timely, it will spread rapidly and spread. When the disease is serious, the leaves of the whole field will be yellow and burnt, resulting in a significant reduction in the yield of carrots. The onset characteristics and control methods of carrot spot blight are described below for reference. First, the main symptoms 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. Second, the characteristics of the disease The pathogen spreads through wind and rain and irrigation water, invading through the pores or penetrating the epidermis. The disease is reinfected frequently and develops rapidly. The pathogens are warm and wet, especially in the management of extensive and weak growth. Third, prevention and treatment methods At the beginning of the disease, 70% mancozeb WP 500 times solution, 80% Xinwansheng WP 600 times solution, 77% wettable wettable powder 800 times solution or 1: 1:200 Bordeaux solution can be used per mu. 50 ~ 60 kg alternate spray, and add a new high-fat film amount, can prevent disease and insect resistance, enhance the efficacy, spray once every 7 to 10 days, even spray 2 to 3 times. More pesticide knowledge , please pay attention to China Pesticide Network KMP Cat Parts,Cat Engine Parts,KMP Cat Stamping Parts,Custom KMP Cat Parts,CAT Spare Parts JINING SHANTE SONGZHENG CONSTRUCTION MACHINERY CO.LTD , https://www.stszcmparts.com