Tomato yellow leaf curl virus is a viral disease transmitted by B. tabaci. The disease has a greater impact on the yield of tomato. After the tomato plants are infected with the virus, the growth of the tomato plant is mainly retarded or stagnated, and the internode shortens and the plant is obviously short. The leaves became smaller and thicker, and the leaves were brittle and stiff. The leaves were wrinkled and curled upwards. The leaf edges were yellow to the veins. The symptoms of the upper leaves of the plants were typical and the symptoms of the lower leaves were not obvious; The swelling rate is slow, and the fruit in the mature period cannot be normalized. In particular, virus infection before flowering resulted in a significant decrease in fruit yield and commodity value. The loss caused by severe disease was 100%, which was one of the most serious diseases affecting tomato yield. Comprehensive prevention measures are as follows:
I. Agricultural control
1, to cultivate disease-free pest-free seedlings. Prevention should be carried out from the seedling stage, so that early prevention and early control can be achieved, and efforts should be made to reduce or prevent the onset of disease. 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.
4. Adults of Bemisia tabaci have a strong tendency to yellow, and they can trap and kill yellow adults in greenhouses.
Second, chemical prevention
Tomato yellow leaf curl virus disease is transmitted by whiteflies. First, early treatment is small, and the early control of B. tabaci population density is relatively low. The first-instar Bemisia nymph nymphs are thin wax and cannot be crawled. There are many opportunities for exposure to pesticides, and the resistance to insecticide is poor. Prevention and control; Second, centralized and unified use of drugs, tobacco powder foraging miscellaneous, host, mobility, mobility, and only the whole ecological environment, especially outside the field of weeds to use drugs in order to control its reproductive harm; Third, the key period Full drug control. 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, butylthioimidacloprid, buprofezin, fipronil, and the like, and different medicaments are alternately used to delay the development 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 glucagon, phytoalexin II emulsion or morpholinium ketide.
Due to people's attention to their own health, Plant Extract medicines have natural sources and less side effects compared to chemical medicines, and plant extract medicines have also attracted attention.
Pharmaceutical grade plant extracts are for the purpose of curing diseases. The same plant extract product can be divided into medical grade and Health Care Grade according to different purposes. Pharmaceutical grade plant extracts contain a single active ingredient and have a high content of active ingredients. Health-care grade plant extracts require low active ingredient content and play a preventive and protective role. In the future pharmaceutical products, medicines derived from natural plant extracts will occupy a very important position.
Natural Plant Extract,Pure Plant Extracts,Herb Extract,Pharmaceutical Grade
Amazy Organic Biotech Co.,Ltd , https://www.amazyorganic.com