(a) Agricultural control 1, to cultivate disease-free pest-free seedlings. The earlier the tomato disease infestation of the disease, the higher the incidence rate, so the prevention should be grasped from the nursery period, so that early prevention and early control, and strive to reduce the incidence of disease or not. The weeds around the seedbed should be cleaned, and the bed soil should be disinfected so as to reduce the source of the disease and be isolated by 40 to 60 mesh insect nets. 2, a reasonable arrangement of crop mouthwash. Avoid colonization with cucumbers and beans when transplanting tomatoes, and try to exchange leeks with onions, garlic, vegetables, celery, and wormwood to reduce the occurrence of Bemisia tabaci. 3, strengthen the cultivation and management. In the tomato growth cycle, use 60-mesh insect nets to cover all vents to prevent B. tabaci from spreading into virus diseases; diseased plants should be removed in a timely manner to reduce the source of poisoning; strengthen the management of fertilizers and water to increase the resistance of plants; B. tabaci. Older nymphs are mostly distributed in the lower leaves, and proper removal of old leaves can effectively control the whitefly. (b) Physical control Because adults of B. tabaci have a strong tendency to yellow, yellow plates can be trapped and killed in greenhouses. Can use 1m0.2m fiberboard or cardboard, painted orange yellow, and then coated with a layer of viscous oil (you can use 10 engine oil plus a little butter and mix well), set 32 ​​to 34 pieces per 667m2, placed between rows, consistent with plant height, The yellow plate needs to be re-coated once every 7-10 days. (III) Chemical Control Tomato yellow leaf curl virus disease is transmitted by whiteflies. Bemisia tabaci has mobility in the field. Therefore, four key technologies must be mastered for the control of Bemisia tabaci: First, early treatment is small, and early control of Bemisia tabaci population density is relatively low. Bemisia tabaci nymphs are of low wax content and cannot be crawled. They have many opportunities for exposure to pesticides, poor resistance to drugs, and are easy to control. Second, they use uniform drugs for concentrating and conjoined medicines, and they are not suitable for insects. They have many hosts, strong mobility, and high fluidity. The whole ecological environment, especially the uniform use of weeds outside the field, can control the reproductive hazards; the third is the entire period of drug control in key periods. B. tabaci breeding rate is high, life cycle is short, the number of groups is large, the generation overlaps severely, eggs, nymphs, adults of a variety of long-term coexist, in the July-September period of B. tabaci breeding peak period must be full drug control Control the proliferation of harm; Fourth, select the quasi-drug, alternating use. The agents that have better control effect on whiteflies include imidacloprid, avermectin, butyl sulphur-imidacloprid, buprofezin, and fipronil, and the different drugs are alternately used to delay the production of resistance. When the field shows symptoms of tomato leaf curl virus disease, virus inhibitors can be sprayed at the early stage of the disease to enhance fertilizer and water management, promote robust growth of plants, and reduce the incidence of losses. Virus inhibitors may be selected from the group consisting of Gram-negative and Gram-negative, Phytopathogen II or morpholinium-ethanone. Auto Chemistry Analyzer,Semi Auto Chemistry Analyzer,Veterinary Automatic Chemistry Analyzer,Dry Chemistry Analyzer Guangdong Widinlsa International Co.Ltd , https://www.guangdongwidinlsa.com
Tomato yellow leaf curl virus disease prevention method