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The pathogenicity of yam erythema
Short worms of Dioscorea can survive in soil for more than 3 years. Diseases in pods and soil in diseased fields are the main roads for disease transmission. Round peas do not transmit disease. The life history of short worms of Dioscorea nematophila is extremely irregular and can often be found in various larvae. It is about 2 generations old and only infests yam. When the beginning of new tuber formation in early June, nematodes can infect, and then the infection continues to grow. Until harvested. Tubers can suffer from more than 40 centimeters from Lutou, with more lesions at 1-20 cm.
Yam spot control method
1. Rotten wheat, corn, sweet potato, potato, cotton, tobacco, pepper, eggplant, tomato, mustard, dill, carrot, watermelon, Radix isatidis, aster, yellow bark, northern ginseng, atractylodes, leeks, horse teeth, etc. Crops that have not been infested are subject to rotation for more than three years.
2. In combination with 0.1-0.35% TMK immersion disease seedlings for 24 hours, the disease-prevention effect is over 95%; in the case of disease-cultivation seedlings and heavy seedlings, 2 kg of 15% TMK granules are applied per acre before sowing. 75% control effect.
3. Disease-free species breeding in disease-free fields, or treatment of seed pods with TMK, combined with rotation and application of disease-free fertilizer and other comprehensive disease prevention measures.
Prevention and cure of yam red spot
Yam spot (spot damage) is a disease caused by nematodes. Diseases during growth, affect tuber development, small tubers, light weight. Nematodes mainly invade underground tubers, initially forming reddish-brown near-circular to irregularly slightly concave spots on the tubers. The individual diseases are sparse and small, with a size of 2-4 mm. On the diseased tubers, the lesions are dense and merge with each other. Form large dark brown lumps, the surface with a fine pattern, the disease magnetic depth of about 2-3 mm, the deepest l cm above the pathogenic tissue was brown dry rot.