Yam erythema is a disease caused by nematodes. Seriously affecting the quality and yield of yam, timely pesticide control is the key.
Erythema disease usually occurs during growth, affecting tuber development, small tubers and light weight. The nematode mainly infects underground tubers, and initially forms freckles on the tubers that are nearly red and brown to irregular rectangles. The single lesions are small and the size is 2-4 mm. On the heavily affected tubers, the lesions are dense and blending with each other. A large dark brown plaque is formed, and the outer surface has fine moiré. The lesion is about 2-3 mm deep and the deepest is more than 1 cm. The pathogenic tissue is brown and dry.
Transmission route and disease conditions Dioscorea zingiberensis can survive in the soil for more than 3 years. The seedlings (sick head), diseased bodies, and diseased soil are the main roads for the disease, and the round beans do not transmit diseases. The life history of the short-spotted nematode is very irregular. It is often found that each insect state is about 2 generations, only infecting the potato stalk. When the new tuber begins to form in the beginning of June, the nematode can infect, and then the infection continues to grow. Until harvest. Tubers can be damaged from the head of the head to more than 40 cm, with more lesions at 1-20 cm.
Pesticide network Xiaobian illegally explain the specific prevention and treatment methods:
1. It is not invaded with wheat, corn, sweet potato, potato, cotton, tobacco, pepper, eggplant, tomato, mustard, radish, carrot, watermelon, radix isatidis, sable, yellow flower, northern sand ginseng, atractylodes, leeks, purslane, etc. The dyed crops are executed for more than 3 years.
2, no disease field breeding: no disease, sputum, or use TMK to solve the mites, and with the rotation and application of disease-free fertilizers and other comprehensive disease prevention methods.
3, the joint rotation: with 0.1-0.3% TMK soaking disease for 24 hours, the disease prevention effect is more than 95%; in the case of diseased seedlings and heavy planting, pesticide manufacturers recommend 15% TMK per acre before sowing 2 kg of granules, 75% control effect.
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