Most of the onset of the disease before and after the harvest. Storage period symptoms occur in the wound and the root eye, the first black dots, gradually expanding into a round, oval or irregular paste-like spots, slightly sunken, the spots can produce gray mold, sick potatoes become bitter, can not be eaten.
Prevention methods:
1, choose disease-resistant varieties.
2, seedling using high cut seedlings planting. When planting, 50% carbendazim or metribuzin can be used to dip the root treatment.
3, the soil with pathogens, need to take crop rotation stubble.
4, storage storage, high temperature healing treatment is the most effective means of preventing and controlling black spot disease. aqui te amo. Sweet potato black spot disease is an important disease in sweet potato production, mainly harming the tuberous root and seedling stem base, all sweet potato production areas are occurring,
Can be transmitted through the seedling and the soil, the disease can be suffered throughout the entire reproductive period of sweet potatoes, the most morbidity before and after the harvest. Storage period symptoms occur in the wound and root eye, the first black dots, gradually expanding into a round,
elliptic or irregular paste-like spots, slightly sunken, the spots can produce gray mold, the sick potatoes become bitter, can not be eaten.
Prevention methods:
1, select disease-resistant varieties.
2, seedling using high cut seedlings planting. When planting, 50% carbendazim or metribuzin can be used to dip the root treatment.
3, the soil with pathogens, need to take crop rotation stubble.
4, storage,
high-temperature healing treatment is the most effective means to control black spot disease. Symptoms of sweet potato black spot disease
Sowers, growing and storage period can occur, the main harm to the potato seedling, potatoes,
Not harm the green part. The spots on the potatoes in the storage period mostly occur on the wounds and root eyes, initially black dots, gradually expanding into round, oval or irregular paste-like spots,
Slightly sunken, varying in diameter from 1 to 5 centimeters, with a clear outline. Disease tissue hard, can penetrate into the flesh of the potato 2 ~ 3 mm, the flesh of the potato is black-green, bitter taste. Late storage is often complicated with other fungal and bacterial diseases, causing rot.
Sweet potato black spot disease prevention and control methods
1, reasonable crop rotation, select the excellent varieties with strong disease resistance,
establishment of disease-free seeding land; before seedling with 50% carbendazim wettable powder plus the new high-fat film 800 times the solution of soaking seeds 5 minutes to deal with the seed potatoes, for the seedlings before transplanting can be used for 50% ethyl tolbutazin 500 times the solution of soaking seedlings plus the new high-fat film 800 times the solution of soaking seedlings 10 minutes, further sterilization.
2, strengthen field management, timely plowing to maintain moisture,
Reasonable fertilizer, and spraying new high fat film 800 times liquid protection of fertilizer, in the sweet potato branching period after the timely spraying of ground fruit strong tilling, in order to effectively control the surface of the upper layer of branches and leaves wildly long, to accelerate the underground tubers ultra-fast expansion, and to enhance the ability of resistance to insect pests, to ensure that the high quality of sweet potatoes, high efficiency and a bumper harvest.
3, pharmaceutical control, the onset of the early stage of the disease should be sprayed according to the requirements of the plant protection of targeted agents (such as 50% carbendazim wettable powder,
75% leucomycetes 500 times liquid) to kill, every 7-10 days 1 time, 3-4 times; and with the spraying of the new high-fat film 800 times to enhance the effectiveness of consolidation of the effect of the prevention and control.
4, select seed potato. After the seed potato out of the cellar, the seedling should be strictly excluded from the diseased, injured and frozen potatoes before the seedling.
5, safe storage. Stay seed potato should be harvested at the right time, prevent frostbite, selected cellar, avoid damage. Seed potatoes into the cellar after high temperature treatment, 35 ~ 37 ℃ 4 days and nights, relative humidity to maintain 90%, to promote wound healing, to prevent disease infection.