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1. Onset Symptoms The diseased leaves become pale at the onset of disease, appear to be bluish-like, later turning brown, dry and curled; the top of the petiole is curved and brownish and dry. Severe incidence of a yellow field, like fire. The underground stems were damaged and transported tissues were obstructed and cross-sections of the stems were examined. The vascular bundles turned brown to brown. The surface of the diseased worm is not smooth, it is stained with water spots, and it seems to be burned by boiling water. In severe cases, the disease turns brown to purple brown, and the rot smells.
2. Incidence of pathogenic bacteria species is the main factor in the epidemic of the disease. In case of continuous rain, lack of sunshine or frequent storms, it is easy to induce the disease; in paddy soil, poor soil permeability, acidic weight, sewage into the field or the water temperature is higher than 35 °C, damage to the rooting insects or application of unripe organic fertilizer, partial Application of excessive nitrogen fertilizer is prone to this disease.
3. Control measures 1 Select the disease-free species, the interval of 2 to 3 years for change. Before transplanting, 100 kg of lime per acre was used for soil treatment. Two kinds of seedlings treatment: 50% carbendazim or thiophanate-methyl powder 800 times sneezing, and sealed with a film for 24 hours stuffy. 3 strengthen field management, so that the application of decomposed organic fertilizer, increase the application of phosphorus and potassium fertilizer, in accordance with the amount of water required during the growth period. In the early stage of disease, the diseased plant should be removed in time. 4 stem and leaf treatment can be used 12% green lactone 700 times or 600 times or carbendazim or thiophanate-methyl fumarate spray 700 times, while 50% carbendazim plus 75% chlorothalonil wettable powder, per acre 500 grams of fine soil 30 kg, heap boring 3 to 4 hours, the field to keep the shallow water layer applied. Both methods can be performed at the same time, once every 7 days, control 2 to 3 times.
Integrated prevention and treatment of lotus root disease
As a light green vegetable, lotus root is very popular among the majority of urban and rural residents. In recent years, the cultivation from Hutang to farmland has brought about considerable economic benefits. This year, it is expected that the corruption of lotus root disease will occur greatly. To this end, Wang Wangnong must make preparations for early prevention and treatment and reduce losses. The specific measures are as follows: