Yam anthracnose symptoms Mainly harmful to leaves and canes. The leaf lesions produce dark green water-stained small spots from the tip or leaf edge, and then expand to brown to dark brown to elliptical or amorphous large spots. The middle of the lesion is grayish brown to grayish white with a round pattern. There are black small dots. The lesions on the cane are dark brown and slightly sunken. When the damage is serious, the leaves fall early and the cane is dead. The occurrence of yam anthracnose Pests caused by fungi. The pathogens mainly overwinter in the diseased tissues, spread by wind and rain, and the incidence of high temperature and heavy rain is heavy. Yam anthracnose prevention and treatment methods: (1) Rotation of the diseased plot for more than 2 years. (2) Remove the diseased body after harvest, concentrate on burning, and deepen the soil. (3) Management with high support, reasonable close planting, and improved microclimate in the field. (4) Strengthen field management, timely tillage and weeding, loose soil drainage; rational fertilization, mainly based on decomposed organic fertilizer, appropriate application of phosphorus and potassium fertilizer, less application of nitrogen fertilizer, cultivation of strong seedlings, and enhanced plant disease resistance. (5) Soak seeds with 50% carbendazim WP 600 times before sowing. (6) Spray 1:1:50 Bordeaux solution after emergence, and spray 2-3 times every 10 days. (7) In the early stage of the disease, the fungicide is 58% metalaxyl • manganese zinc wettable 500 times liquid, 68% gold leidom water dispersible granule 1000 times liquid, 80% anthrax melamine wettable powder 800 times liquid, 50 % Tsuibei dry suspension agent 3000 times solution, 70% methyl thiophanate WP 1500 times solution, 50% chlorhexidine WP 1000 times solution, 50% application WP 1500 times solution, 25% torch Volumetric Water Meter,Rotary Piston Water Meter,Piston Water Meter,Ultrasonic Residential Water Meter Shandong Chenshuo Meter Co., Ltd. , https://www.chenshuometer.com