After virus infection, eggplant plants showed mainly retarded growth or stagnation, internode shortening, dwarfing of plants, thinning and thickening of leaves, hard and hard leaves, wrinkled and upwardly curled leaves, yellowing of leaf margins to veins. The symptoms of the upper leaves of the plants were typical, and the symptoms of the lower old leaves were not obvious; the later performance was less in fruit set, the fruit became smaller, the rate of enlargement was slow, and the fruit in the mature stage could not 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:
Agricultural control:
Cultivate disease-free pest-free seedlings to prevent from the nursery period, so that early prevention and early control, and strive to reduce the incidence of disease or not. To remove weeds from the seedbed, clean the seedbed soil to reduce the source of disease and use a 40-60 mesh insect screen for isolation.
Arrange the crops to prevent the colonization of cucumbers and legumes when planting tomatoes, and try to exchange leeks with onions and garlic vegetables, celery, and wormwood to reduce the occurrence of whiteflies.
Strengthen the cultivation and management In the tomato growth cycle, use 60 mesh insect nets to cover all the vents to prevent Bemisia tabaci to enter the spread of viral diseases; diseased plants should be promptly removed at the seedling stage in order to reduce the source of poison; strengthen the management of fertilizer and water, improve plant disease resistance; Most of the older nymphs of Bemisia tabaci were distributed in the lower leaves, and proper removal of old leaves could effectively control B. tabaci.
Adults of Bemisia tabaci have strong tropism toward yellow, yellow traps can be trapped and killed in greenhouses.
Chemical control:
First, early treatment is small. Early control of Bemisia tabaci population density is relatively low. The first age Bemisia nymph nymphs are thin wax, can not crawl, have more access to pesticides, poor drug resistance, easy to control .
The second is to focus on continual and uniform drug use of tobacco powder for feeding and miscellaneous purposes, with many hosts, strong mobility, and high mobility. Only the whole ecological environment, especially the use of weeds outside the field, can control its breeding damage.
Thirdly, the full-time drug-controlled Bemisia tabaci in key time periods has a high reproductive rate, a short life cycle, a large number of populations, and overlapping generations. Eggs, nymphs, and adult worms coexist for a long period of time. During the peak period of Bemisia tabaci breeding in July-September, A full course of drug control is required to control its reproduction.
The fourth is the selection of quasi-drugs, alternate use of whitefly have better control effect of the agents are: imidacloprid, avermectin, thiopiclide, fluoclopramide, fipronil, etc., different drugs to be 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 glucagon, phytoalexin II emulsion or morpholinium ketide.
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