The common root diseases of peanuts are: stem rot and root rot, and their diseases and pesticide control methods are as follows
First, peanut root rot can occur in the whole growth period, peanut roots rot, no lateral roots or few lateral roots after extraction, the roots are rat tail. When the seedlings are damaged, the main roots become brown, the susceptible plants are short, and the leaves turn yellow and withered from bottom to top. The symptoms of adult stage cause a slight brown spot on the roots, and the ground part gradually wilted and died. It is transmitted by rainwater and field farming operations. Water is accumulated in the field during seedling period, and the temperature is low or the planting is too early or too deep.
Second, peanut stalk rot When the initial disease, the surface of the diseased part produces irregular brown plaques, which turn into dark brown, and expand to the vertical and horizontal, and finally form a diseased spot around the stem, causing destruction of the guided tissue. When the disease is light, the upper part of the ground becomes yellow, and the whole stem rots and the upper part of the ground wilts and dies. It takes about one week from the onset to the death of the seedlings. After the flowering period, some of the lateral branches often die, and some of the lateral branches can still form pods.
Third, peanut stalk rot and root rot prevention and control measures
1. Select resistant varieties, such as Yuhua No.7 and Luhua No.11.
2. Improve seed quality. The seed field should be harvested in a timely manner, dried in time, properly stored, and prevented from mildew. Seeds are selected before sowing, and the seeds of discoloration, mildew and bruises are strictly removed.
3. Reasonable rotation. After several years of heavy peanuts, the root disease will increase year by year, and the replacement will be alleviated. In general, light disease fields can be rotated every other year, and heavy disease fields can be used for three years, and wheat, corn and other cereal crops can be used for teasing.
4. Add organic fertilizer, carry out “clearing seedlings†in the seedling stage, and adopt measures such as surging grass ash, timely removing diseased plants and carrying out field treatment.
5. Prevention and control of fungicides . 50% carbendazim wettable powder can be used for seed dressing at 0.25%-0.5% of the seed amount, or 100-fold liquid to 200 times liquid soaking for 24 hours; with 10ml of bag per ounce of Synecht Syndrome Water 0.1 kg evenly mixed with 5 kg to 8 kg, and then sown after drying; in the early stage of the disease, spray with 50% carbendazim 600 times + allicin 2000 times mixture, spray once every 5 to 6 days, even spray 2 Times ~ 3 times.
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