Common diseases and pests of lotus root and their control

Corruption disease (1) Symptoms. Underlying stems are affected, and the previous symptoms are not obvious. The vascular bundles in the center of the underground stems are browned. Later, the discolored parts gradually enlarge. In severe cases, the underground stems, nodes, and fibrous roots turn brown and rot. At the beginning of the disease, the leaf color became lighter, and the leaf margin appeared water-streaked wilting, which gradually expanded inwards and then became brown and dry. Buds and flowers withered. It was also called wilt disease. When the disease became severe, the whole field was yellow and fire-like. The disease seriously affects the yield and quality of alfalfa, generally reducing production by 10% to 20%, and severely reducing production by more than 30%. (2) Control methods: First, adopt local disease-resistance varieties; second, implement severe drought-fighting fields for 2 to 3 years. Rotation. The third is the selection of disease-free species, and before planting with 50% carbendazim or 70% thiophanate-methyl WP 800 times spray, and then cover the plastic film, sealed for 24 hours, and then dry and plant. The fourth is to maintain deep-water immersion in winter, do not turn over the sun. When the incidence of heavy growth season, deep water irrigation can be used to inhibit the development of the disease. Fifth, every 1/15 hectares before the site preparation of lime 75 to 100 kg. Six is ​​full. Decomposed organic fertilizer, and timely fertilizer. Topdressing nitrogen, phosphorus, potash fertilizer with the application, but also make-up application of molybdenum fertilizer, zinc fertilizer, boron fertilizer and other trace fertilizer. Seven is the early stage of disease, we must promptly remove diseased plants, and use more than 50% 200 times liquid of mycelia or spray. Leaves of Cercospora leaf spot (1) Symptoms. The lesions are round or nearly round, of varying sizes, light brown in color, some have concentric ring patterns, dense black spots on the lesions, and lesions are dense and even spotted when severe. Block, diseased leaves partially dry. (2) Prevention and control methods. Collect and dispose of the diseased body deeply or burn it out, implement severe cropland rotation, and chemical control refer to corruption disease. Anthrax (1) symptoms. The lesions on the leaves are round or irregular, slightly concave, reddish-brown, and ringy. There are many small black spots on the lesions at the late stage of disease. (2) Control methods. Reference can be made to the control of leaf spot of Cercospora viridis. In addition, 80% anthraquinone omeprazole WP can be used 800 times or 2% wuyimycin can be sprayed 150 times, sprayed every 7 to 10 days, even sprayed. 2 to 3 times. Mosaic virus disease (1) symptoms. The more robust plants of the diseased plants are shorter, the leaves become thinner, some of the leaves become chlorotic, and deformity shrinks. Some wrappings do not spread. In the diseased field, common plants are affected by the cluster of aphids. (2) Control methods. The diseased plant was found to be immediately removed, and at the same time, it was killed and prevented in the peak period of the migration of the aphid. In the early stage of disease, 5% sputum poisonous WP or 20% virus A was used for spray prevention and control, 7 to 10 days, Even spray 2 or 3 times. The lotus root tuber mainly damages the floating leaves, young leaves, vertical leaves, leaf stems, petals, etc., resulting in yellow leaves and poor growth. Control methods: Pay attention to the protection of ladybugs, cockroaches bees, food flies and other natural enemies. When the percentage of alfalfa plants reaches 15% to 20%, 10% imidacloprid wettable powder 1500 times liquid or 25% enemy liquid killing 2000 times liquid spray can be used. Leaf-living mosquitoes mainly damage the floating leaves of lotus. When they occur, the leaves are covered with purple and black insect spots, which start to rot around, and finally the whole leaves wither. Control methods: Remove insect floating leaf, concentrate burning or deep buried. Found pests At the time, it can be sprayed with 3 worms of 5% net cream 1500 times or 25% quixphos 1500 times spray.



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