1 symptoms
Peanut bacterial wilt can occur in every growing period of peanut, and it is the most frequent occurrence in flowering period. The diseased plants initially showed wilting, with delayed leaf opening in the morning and early leaf closing in the afternoon. Withered from top to bottom, the first branch of the main stem was withered and the nodule was dark green.
2 Incidence of the law
Ralstonia solanacearum wintered in the soil and invaded the roots of peanuts or natural orifices in the second year. The average temperature on that day was stable above 20°C, and the ground temperature of 5cm was stable at 25°C or above for 6-8 days. Peanut plants in the field began to develop symptoms, and the disease spread mainly through ploughing the land and watering.
In general, the incidence of drought is heavy. During the growing season, the disease develops rapidly after sudden rainstorms occur. The low-lying land is prone to flooding, and the incidence of light-drained fields is light; the soil with shallow soil and poor fertility is more soilless than that of soil and water and fertilizer. Good sandy soil is heavy. The incidence of disease in the rotation was light, and the incidence of disease was heavy for consecutive crops.
3 Control Technology
(1) Crop rotation, drylands and cereal crop rotations, 1-3 years for critically ill and 4-5 years for severe disease.
(2) Strengthen cultivation, remove water from the field in time, improve soil, increase organic fertilizer, and perform high-temperature fermentation of the diseased body.
(3) Chemical control, 25% adversary, 2.5 kg per acre, cover with medicinal soil, or root with 1000 times liquid.
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