In summer, the temperature rises, and pests have become the focus of greenhouse vegetable control. When the author visited the countryside, he listened to the farmers and said that they did not know that the pests had "evolved". They were still fake drugs, but they couldn't control drugs repeatedly. So, is pests more and more difficult to control? The author analyzes that the reasons are as follows:
One is that the pests have developed resistance. The pests “evolved†by vegetable farmers are also known to have developed drug resistance. A vegetable farmer should have some experience. If a pest is always treated with a chemical, it starts to work well, but slowly it doesn't work. This shows that the pest has developed resistance to the pesticide. In order to avoid pest resistance, it is necessary to pay attention to the use of various pesticides.
The second is that prevention and treatment are too late. The longer the worms, the stronger the resistance to drugs. In general, pests have entered the 5 to 6 instar period, not only have a strong ability to resist drugs, but also expand the scope of activities, increasing the difficulty of drug control. Before the 3rd instar of pests is the best period for drug control, if the medication is used at this time, the efficacy will be good.
The third is poor spray quality. Before a vegetable farmer controls a certain pest, he must first understand the characteristics of the pest. If some of the pests like to hide on the back of the leaves of the plant, they should mainly use the back of the leaves when spraying, but also pay attention to the fineness of the spray. Sprayer sprayer should be replaced at regular intervals, because it will not spray water but water for a long time, so the effect of pest control will be greatly reduced. In addition, in order to improve the control effect, you can add adhesives when spraying, such as adding a neutral detergent can play a very good effect.
The fourth is that insecticide does not kill eggs. The vegetable farmers pay more attention to the prevention and control of adults and ignore the prevention and control of eggs, which is also the reason for the prevention and control of pests. Therefore, in the use of drugs should be mixed within the absorption of egg killing agents, such as the control of whitefly, acetamiprid can be mixed with buprofezin insecticide ovicidal control.
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