Comprehensive Prevention and Treatment of Common Diseases of Lotus Root

First, the common diseases of lotus root

1, lotus root spoilage disease, also known as black root disease, sputum. It is the first major disease in the production of lotus root, and it is generally susceptible to disease in the old paddy fields and continuous cropping fields with shallow and shallow layers of cultivation, which will affect the yield and reduce yield. It is a disease of lotus root which is caused by the infection of cysts and stems. It mainly damages underground stems, aboveground leaves and foliage. The stems and leaves with light green color were light green, brown and dry from the leaf margin, and the petiole was finally dead. Most of the bacteria invade the wound, absorb roots or growth points, and pathogens spread with water irrigation.

2. Lotus leaf blight is the second most serious disease on lotus root, and the pathogen is the pathogenic fungus of the monofilament genus. The main damage to the lotus leaf, the lotus leaf edge first appears pale yellow lesions, and then gradually spread to the middle of the leaves, yellow-brown, and finally expanded from the leaf marrow to the veins, until the whole leaf withered. High temperature and rainy, favorable disease, insufficient fertility in Putian, serious diseases.

3, lotus leaf spot mainly damage the leaves, sometimes on the petiole can occur, is caused by the fungal pathogen of the genus Rodius.

Second, lotus root disease, comprehensive prevention

1. Implement a 2-3 year rotation. In particular, the rotation of floods and droughts plays an important role in reducing disease.

2. The selection of disease-free species and planting of various species of helminths is the main source of fungal pathogens. To prevent the disease, the key is to choose the healthy plants from disease-free cultivars as a kind of pods to prevent the source of bacteria. Before phytolithiasis, cultivars should be used. 50% carbendazim or thiophanate-methyl 800 times, or 75% chlorothalonil wettable powder 800 times spray, cover with a plastic film boring 24 hours, dry and sow.

3. Eradicate the diseased plants to completely remove the diseased field and diseased bodies of the fields, and bury them deeply or burn them centrally. Before planting, 50-100 kilograms of lime is used per acre to sterilize and clean the pastoral area, and accelerate the decomposition of organic fertilizer.

4, rational fertilization base fertilizer should be based on organic fertilizer, fertilizer must be fully decomposed. For soils with acidic soils and strong reducing properties, lime should be re-used. Lime should be applied early and applied. During the growth period, attention should be paid to the application of nitrogen phosphate fertilizers. Silicon fertilizers should be added wherever possible, and supplemental boron, zinc, molybdenum, and other trace fertilizers are recommended. Do not apply chemical nitrogen fertilizers to improve plant disease resistance.

5, scientific management of water sick period deep water irrigation, reduce ground temperature inhibition of bacterial reproduction. Keep the lotus field soaked in deep water every day. Do not drain the water and turn it over in the winter. Non-reserved farms must cut down the horticultural tillage or dig hoe after harvesting lotus seeds, and it is best to plant a winter crop. For those who don't plant winter crops, they should also plunge and flood the fields to reduce the contamination of soil and diseased bodies.

6, timely medication control. At the beginning of the disease, use 50% carbendazim WP 600-800 times, or 50% TOPOX WP 800-1000 times, or 50% carbendazim WP 600 times 75% chlorothalonil 600 times liquid spray. It is also possible to use the above-mentioned mixed powder 500 grams of fine soil 25-30 kg, heap boring after 3-4 hours into the shallow water layer of lotus root, 2-3 days after the above mixture 600 times or 70% thiophanate-methyl 800 Double liquid, carbendazim 200 times liquid mixing "402" 4000 times, spraying foliar or petiole, even spray 2-3 times, can effectively reduce or control the spread of the disease.

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