Cure Greenhouse Whitefly in Spring
Trialeurodes vaporariorum is an insect of the family Homoptera, which mainly overwinter on weeds as eggs or adults. It is one of the main pests that have affected vegetable production in the north in recent years. Recently, the weather has become warmer and the temperature in the greenhouse has increased significantly, which has provided favorable factors for the growth of whitefly to harm crops. In order to prevent and control whitefly in greenhouse as soon as possible, the following comprehensive measures should be taken for prevention and control.
â—†Characteristics of whitefly damage in greenhouse
It is difficult to find that the adult body is 1~1.5 mm long, light yellow, and the wings are covered with white wax powder. When resting, the two wings form a roof on the body like a moth. The wing ends are semicircular to cover the entire abdomen, and the wing veins are simple. There is a row of small particles along the outer edge of the wing.
The greenhouse environment is good for reproduction. The greenhouse can occur for more than 10 generations a year, and it cannot survive outdoors in winter. Therefore, various insect states live in the greenhouse and continue to damage. Adults can mate and lay eggs 1 to 3 days after emergence, with an average of 142.5 per female. Parthenogenetic reproduction is also possible, and the offspring are males. Adults are tender. Before the host plant tops the top, the adults always chase the top young leaves to lay eggs with the growth of the plant wipes. Therefore, the top-down distribution of whitefly on the crop is: newly laid green eggs, Blackened eggs, first-instar nymphs, old nymphs, pseudo-pupas, newly emerging adults. The whitefly eggs are inserted into the leaf tissue from the stomata with the egg stalk, and maintain water balance with the host plant and are extremely difficult to fall off. The nymphs can walk a short distance on the back of the leaf within 3 days after hatching. When the mouthparts are inserted into the leaf tissue, they lose their crawling function and start a fixed life.
Adults and nymphs who gather to suck sap suck plant sap. The damaged leaves become green, yellow, wilt, and even the whole plant dies. In addition, due to its strong fecundity, fast reproduction speed, large population, group damage, and secrete a large amount of nectar, which seriously pollutes leaves and fruits, it often causes the occurrence of coal pollution and makes vegetables lose their commercial value. In addition to serious damage to tomato, green pepper, eggplant, potato and other solanaceous crops, it is also a serious pest to cucumber and kidney bean.
â—†Two-pronged approach, good prevention effect
The control of whitefly should follow the plant protection policy of prevention first and comprehensive control, strengthen vegetable cultivation and management, and use both physical and chemical agents to improve the control effect.
Physical control 1. Promote the first planting of cold-resistant crops such as celery and yellow garlic that whitefly does not like in the greenhouse, and reduce the planting area of ​​cucumbers and tomatoes. 2. Cultivating "insect-free seedlings" separate the nursery room from the production greenhouse, thoroughly smoke and kill the residual insects, clean up weeds and stubbles, and seal the nylon yarn at the vents to control the source of foreign insects. 3. Avoid mixed planting of cucumbers, tomatoes, and kidney beans. 4. Avoid planting cucumbers, tomatoes, eggplants, kidney beans and other vegetables with serious occurrence of whiteflies near greenhouses and sheds. Promote the cultivation of cruciferous vegetables that whitefly does not like to reduce the source of insects. 5. Whitefly is sensitive to yellow and has a strong tropism. Yellow boards can be set up in the greenhouse to trap and kill adults. Set 32 ​​to 34 blocks per acre, which can be placed between the rows to be the same height as the plant. In addition, because whitefly reproduces quickly and easily spreads, production units within a region should pay attention to joint prevention and treatment to improve the overall control effect. 6. It can release artificially, once every two weeks, for a total of 3 releases of 15 adult bees per plant. The parasitic wasps can establish populations in the greenhouse and can effectively control the damage of whitefly.
Chemical control is used for chemical control, which must be used several times in succession. The available agents and concentrations are as follows:
1.10% Motujing Emulsifiable Concentrate 1000 times liquid. 2. 25% Mite Mite Emulsifiable Concentrate 1000 times liquid is effective against whitefly adults, eggs and nymphs. 3. 20% Kang Fu Duo concentrated solvent 4000 times liquid. 4.2.5% Uranus EC 3000 times liquid can kill adults, nymphs, and false pupae, but the effect on eggs is not obvious. 5.2.5% Kung Fu EC 3000 times liquid. 6. 20% metsauri EC 2000 times liquid, azadirachtin 800 times liquid; deltamethrin 3000 times liquid, fenvalerate 2000 times liquid and so on. Continuous application has good results.
Disclaimer: Some articles on this website are transferred from the Internet. If the legal rights of third parties are involved, please inform this website for processing. phone
Product Details
*Fully integrated "production line"
*Maximize growth space
*Increase production capacity
*Reduce planting cost
*Easy to operate, Coordination.
*Heavy duty 600-800kg/shelf
JIANGSU SKYPLAN GREENHOUSE TECHNOLOGY CO.,LTD , https://www.engreenhouse.com