In the summer, the temperature rises, and the pests become the key targets for the control of greenhouse vegetables. When I went to the countryside to visit, I heard the vegetable growers say that the pests have "evolved", or the pharmacy has been faked. So, is it more and more difficult for pests to control? The author believes that the reasons are as follows:
First, pests develop resistance. The “evolution†of the pests mentioned by the vegetable growers is that they have developed resistance. The vegetable grower friend should have some experience. If the same kind of pesticide is always used for the control of a pest, it is very effective at first, but it does not work. This indicates that the pest is resistant to the agent. Correct
Therefore, in order to avoid the resistance of pests, it is necessary to pay attention to the use of various insecticides.
Second, the prevention time is too late. The older the insect, the stronger the drug resistance. In general, pests enter the 5-6 age group, which not only has a strong ability to resist drugs, but also expands the scope of activities, increasing the difficulty of drug control. Before the 3rd instar pests, it is the best period for drug control. If the drug is used for prevention and treatment at this time, the efficacy will be good.
Third, the quality of the spray is poor. Before farmers can control certain pests, they must first understand the characteristics of the pests. For example, some pests like to hide on the back of the leaves of the plants. When spraying, the back of the leaves should be the main one, and the spray should be fine. The spray of the sprayer should be replaced regularly, because the time is not the spray but the water, so the insect control effect will be greatly reduced. In addition, in order to improve the control effect, it is possible to add an adhesive at the time of spraying, such as adding a neutral detergent powder to achieve a good effect.
The fourth is that insecticide does not kill eggs. Vegetable farmers pay more attention to the prevention and control of adult worms and neglect the prevention and treatment of eggs, which is also the cause of the difficulty in controlling pests. Therefore, when the drug is used, it should be mixed with a system for inhaling egg-killing agents, such as controlling whitefly, and it can be controlled by mixing acetamiprid with buprofezin to kill eggs and kill eggs.
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