Spring blooms in the greenhouse

Whitefly is a whitefly of the family Homoptera, which mainly overwinters eggs or adults on weeds. It is one of the major pests that affect the production of vegetables in northern China in recent years. Recently, the warming of the weather and the dramatic increase in greenhouse temperatures have provided favorable factors for the growth of whiteflies against crops. To prevent and control greenhouse whitefly as soon as possible, the following comprehensive measures should be taken to prevent and control it.

â—†Whitehouse locust damage characteristics

It is hard to find adult body length 1 to 1.5 mm, pale yellow, wavy surface covered with white wax powder, when the wings are closed, the wings are synthesized on the body like ridges, and the wings are semicircular to cover the entire abdomen, with simple veins. There is a row of small particles along the outer edge of the wing.

Greenhouse environment Good breeding greenhouses can occur for more than 10 generations a year, and they cannot survive outdoors in winter. Therefore, wintering and continuation of damage are caused by insects in greenhouses. One to three days after emergence of adult mate can lay eggs, with an average of 142.5 grains per woman. Parthenogenetic reproduction can also be performed, and its offspring is male. Adults tend to have tenderness. Before the host plant topping, the adults always chase the top leaves as they grow, so the top-down distribution of the whitefly is as follows: Blackened eggs, early-instar nymphs, old-age nymphs, nymphs, new adult nymphs. The whitefly eggs are inserted into the leaf tissue from the stomata with an egg stem and maintain a water balance with the host plant, which is extremely difficult to fall off. The nymphs can travel a short distance on the back of the leaf within 3 days after hatching. When the mouthparts are inserted into the leaf tissue, they will lose their crawling function and begin to live in a solid state.

Aggregation can damage the sap and the nymphs can suck the plant sap. The damaged leaves chlorosis, yellowing, wilting and even the whole plant withers. In addition, due to its strong fertility, rapid reproduction, large populations, and flocking, it also secretes a large amount of honey liquid, which seriously pollutes the leaves and fruits, and often causes the occurrence of coal pollution, which causes the vegetables to lose their commodity value. In addition to serious damage to tomato, green pepper, eggplant, potatoes and other solanaceae crops, it is also a serious pest of cucumber, bean pests.

â—†Two-pronged control effect

The prevention and control of whitefly should be based on the plant protection policy that focuses on prevention and comprehensive prevention and control, strengthen the cultivation and management of vegetables, and use physical and chemical agents together to improve control efficiency.

Physical control 1. Promote the first greenhouse planting whiteflies do not like eating celery, garlic yellow and other relatively low temperature resistant crops, while reducing the cucumber, tomato planting area. 2. Develop “no insects” to separate the seedlings room from the production greenhouse, completely kill the remaining insects before the nursery, clean the weeds and stubbles, and seal the nylon yarn at the vents to control the foreign insects. 3. Avoid cucumbers, tomatoes, beans mixed. 4. Avoid vegetables, such as cucumbers, tomatoes, eggplants, beans, etc., in the greenhouses and greenhouses. Promote the cultivation of cruciferous vegetables that do not like to eat whitefly, in order to reduce the source of insects. 5. Whitefly is sensitive to yellow and has strong tropism. Yellow plates can be trapped and killed in greenhouses. Set 32-34 pieces per acre and place them in the same height as the plants. In addition, due to the rapid spread of whitefly propagation, production units within a region should pay attention to joint prevention and treatment to increase overall control effectiveness. 6. The larva canister can be released artificially and released once every two weeks for a total of 3 times to release 15 larvae and bees into the bee. The parasitic bee can establish population in the greenhouse and can effectively control whitefly infestation.

Chemical control is controlled by chemical agents and must be administered several times in succession. The following agents and concentrations are available:

1.10% puppet net emulsion 1000 times. 2.25% of fleas and intensive milk oil 1000 times solution are effective for whitefly adults, eggs and nymphs. 3.20% Confodine concentrated solvent 4000 times. 4.2.5% Uranus EC 3000 times can kill adult, nymph, and false fleas, but the effect on eggs is not obvious. 5.2.5% Kung Fu EC 3000 times. 6.20% chlorimethanol emulsifiable concentrate 2000 times, azadirachtin 800 times; deltamethrin 3000 times, fenvalerate 2000 times and so on. Continuous application has better results.

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 Injection Device

Syringes can also call Disposable Medical Supplies, Disposable Syringe With Needle and Plastic Needle Tube such as some scientific instruments in chromatography to inject through the rubber septum. Injecting gas into a blood vessel will cause an air embolism. The way to remove air from the syringe to avoid embolism is to turn the syringe upside down, tap it lightly, and squeeze out a little bit of fluid before injecting into the bloodstream.

In some cases where accuracy is not the primary concern of germs, such as quantitative chemical analysis, glass syringes are still used due to the small error of the glass syringe and the smooth movement of the push rod.

You can also inject some of the juices into meat with a syringe to improve taste and texture while cooking, or into pastries when baking. Syringes can also fill ink cartridges with ink.

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