First, the initial disease of peanut stalk rot, the diseased part of the surface irregular brown patches, after becoming dark brown, extended to vertical and horizontal, and finally formed a lesion around the stem one week, so that the transmission of tissue damage. When the disease is light, the upper part of the ground is yellow, and after the whole stem is rotted, the upper part of the ground is wilting and dead. It takes about one week from the onset to the death of the seedling stage. After the flowering period, some side branches often die, and some side branches are still able to bear fruit. 2. Peanut root rot disease can develop during the entire growth period. Peanut roots are rotted, and no lateral or less lateral roots are found after extraction. The roots are rat-tailed. The seedlings were damaged, the main roots became brown, the susceptible plants were short, and the leaves turned yellow and withered from bottom to top. Symptoms of the adult stage caused a slight brownish spot on the roots, and the above-ground parts gradually wilted and died. Relying on rainwater and agricultural operations in the field, the water in the field at the seedling stage, the ground temperature is low or the planting too early or too deep can easily cause the disease. III. Control measures 1. Select resistant varieties such as Yuhua No. 7 and Luhua No. 11. 2. Improve seed quality. Seed fields should be harvested in due course, dried in time, properly stored, and prevented from mildew. Before the sowing, they were selected again to remove the seeds of discoloration, mildew, and bruises. 3. Reasonable rotation. Peanut replants for several years, the root disease will increase year by year, replacement will reduce. General sick fields can be made every year round, and severe disease fields can be used for 3 years. They can be used for cereals such as wheat and corn. 4. Chemical control. Use 50% carbendazim WP to mix seeds of 0.25% to 0.5% of seeds, and also use 100 times to 200 times of liquid to soak seeds for 24 hours; use Ruitu Syngenta Co., Ltd. to produce 10ml of each bag. Water 0.1 kg uniform seed dressing 5 kg ~ 8 kg, dry after sowing; early onset, with 50% carbendazim 600 times + Ethyl allicin 2000 times mixed liquid spray, interval 5 days to 6 days spray once, even spray 2 - 3 times. 5. Increase the use of organic fertilizers, seedling period, "Qingke seedlings," and to take over the use of plant ash, timely removal of diseased plants and to carry out field treatment and other measures.
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