vegetable pests in greenhouses

With the improvement of people's living standards, people are increasingly pursuing a higher quality of life and admiring green food, which puts forward higher requirements for the pest control of greenhouse vegetables. According to the plant protection principle of "prevention first, comprehensive control" Working policy, combined with years of experience in agricultural technology promotion, now talk about the comprehensive control of vegetable pests in greenhouses.
1. Agricultural prevention and control

Agricultural prevention and control mainly focuses on strengthening the cultivation and management of facility vegetables and cultivating insect-free seedlings. Combined with agricultural operations, the stems, leaves and residual plants of the previous crops are completely removed, and the aging leaves and weeds at the lower part of the plants are removed at any time, and they are taken out of the protected area. destroy. In addition, it is necessary to arrange the crops reasonably to avoid continuous cropping and continuous cropping of Solanaceae, Cucurbitaceae, Leguminosae and Cruciferae, and to prevent continuous damage from pests and diseases.
2. Physical control

Physical control is mainly through the use of insect-proof nets to block and yellow boards to trap and kill pests and diseases. Insect-proof nets can be added on the inside of the film around and at the door of the greenhouse or solar greenhouse to prevent the invasion of diseases and insect pests when the film is lifted for ventilation. Adults of pests and diseases are sensitive to yellow and have strong yellowing property. The yellow rubber sheet made of special environmental protection glue such as Vaseline and butter can be used to trap and kill pests and diseases.
3. Biological control

Biological control mainly involves the use of biological pesticides and natural enemy control techniques. Biological pesticides for the control of pests and diseases mainly include abamectin preparations and Beauveria bassiana. Using natural enemies to control pests is an ecologically safe pest control technology. Liphid wasps are effective natural enemies of pests and diseases, and they are released for the first time at the early stage of pests and diseases; according to the environmental temperature of the facility, the ratio of benefit to pests in the initial release of adults is adjusted; when the population of pests and diseases is large, it can be released additionally; the release time is set at 8 am The distance between release points in the field must be controlled within 8 meters. In addition, the release of predatory natural enemies such as Chinese lacewings, small flower bugs and East Asian flower bugs also has a certain control effect on diseases and insect pests.
4. Chemical control

Chemical control is one of the important means to control pests and diseases. The main chemical agents for controlling pests and diseases are 50% clothianidin water dispersible granules, 17% flupyrfurone soluble solution, 10% cyantraniliprole dispersible oil suspension concentrate, 50% sulfoxaflor water dispersible granules , 22.4% spirotetramat suspension concentrate, 25% thiamethoxam water dispersible granules and 10% nitenpyram water agent, etc. During chemical control, pesticides with different mechanisms of action should be used in rotation according to the recommended concentration of pesticides to avoid and delay the emergence of drug resistance, and at the same time try to use environmentally friendly pesticides.
5. Ecological prevention and control measures

After years of vegetable greenhouse planting practice, the farmers have accumulated a lot of planting experience. Although it is a greenhouse planting, once it is affected by bad weather and the environment, it will cause poor ventilation in the shed, high temperature, high humidity, and leaf hardening. Dew, dripping water from the roof, etc., will increase the probability of pests and diseases. According to the results of greenhouse pilot projects in these years and the accumulation of previous planting experience, it can be seen that diseases and insect pests are easy to breed in generally acidic environments, which provides people with ecological control countermeasures, by spraying alkaline and harmless substances on the leaves of vegetables , Through ecological regulation, it can effectively prevent and control scab and downy mildew and other pests and diseases.