Tomato yellow leaf curl virus disease is a viral disease transmitted by Bemisia tabaci, which has a great impact on tomato yield. After tomato virus infection, the main symptoms of growth are stagnant or stagnant, the internodes become shorter, and the plants are obviously shorter. The leaves become smaller and thicker, the leaves are brittle and hard, the leaves are wrinkled, curl upwards, and the leaves are marginal to the vein area. The symptoms of the upper leaves are typical, and the symptoms of the lower leaves are not obvious. The swelling speed is slow, and the fruit in the mature period cannot be changed normally. In particular, the virus is infected before flowering, and the fruit yield and commercial value are greatly reduced. The damage caused by severe cases can reach 100%, which is one of the most serious diseases affecting tomato yield. The comprehensive control measures are as follows:
Agricultural Control:
Cultivate disease-free and insect-free seedlings. Prevention should be taken from the nursery period, early prevention and early control, and strive to reduce the incidence or not. The weeds around the seedbed should be cleaned, and the soil in the seedbed should be disinfected to reduce the source of the disease and isolated with 40-60 mesh insect nets.
Arrange the crop gargle reasonably. When planting tomatoes, avoid mixing with cucumbers and beans, try to change them with onion and garlic vegetables, celery, and wormwood to reduce the occurrence of whitefly.
Strengthen cultivation management. In the tomato growth cycle, use 60 mesh insect nets to cover all vents to prevent B. tabaci into the spread of viral diseases; in the seedling stage, the diseased plants should be removed in time to reduce the source of poison; strengthen the management of fertilizer and water, and improve the disease resistance of plants; The older nymphs are mostly distributed in the lower leaves, and proper removal of the old leaves can effectively control the whitefly.
Adults of Bemisia tabaci have strong tropism in yellow, and yellow plates can be placed in greenhouses to trap adults.
Chemical Control:
Tomato yellow leaf curl virus disease is transmitted by B. tabaci. First, the treatment of early treatment is small, and it is very important in the early prevention and control of the population density of Bemisia tabaci, which is relatively small. The nymphs of the first-instar beech are thin, can not crawl, have many opportunities to contact pesticides, and have poor resistance. Prevention and treatment.
The second is to concentrate on the uniform use of drugs, the smoked powder is miscellaneous, the host is more, the migration is strong, and the mobility is large. Only the whole ecological environment, especially the weeds in the field, can be used to control the breeding.
The third is the full-time drug control during the key period. Bemisia tabaci has a high reproductive rate, a short life cycle, a large number of populations, and a serious overlap of generations. Eggs, nymphs, and adult insects coexist for a long time. In the peak period of the breeding of Bemisia tabaci in July-September, the whole process must be controlled. Control its reproduction.
The fourth is to select the drug and use it alternately. The agents that have good control effect against Bemisia tabaci are: imidacloprid, avermectin, butyl sulphide, imidacloprid, chlorpyrifos, fipronil, etc., and different agents should be alternately rotated to delay the generation of resistance. When the field shows the symptoms of tomato leaf curl virus disease, it can spray virus inhibitors in the early stage of the disease to strengthen the management of fertilizer and water, promote the robust growth of plants and reduce the loss of disease. The virus inhibitor may be selected from the group consisting of a gram gram gram water agent, a phytopathogenic II emulsion or a morpholinone ketone.
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