Why is the use of pesticides not ideal?

With the increase of temperature and the increase of rainfall, various diseases and insect pests on vegetables have also occurred. Some vegetable farmers have not used pesticides many times, and the effect is not satisfactory. Not only does it waste a lot of financial and human resources, but also causes pesticide residues in vegetables to exceed the standard, affecting the commercial value of vegetables, and even losing the value of food. The reasons for the unsatisfactory effect of using pesticides are as follows:

1. There is no planned rotation of pesticides, so that pests and diseases can develop resistance quickly and affect the control effect of pesticides.

2. Do not pay attention to scientific use of drugs, do not use pesticides according to the prescribed dose, number of medications, medication methods and safe intervals, increase the dose and number of use without authorization, mistakenly believe that the larger the dose, the more the use, the shorter the safety During the interval, the effect of controlling pests and diseases will be better. In fact, it is very easy to produce phytotoxicity, and it will also lead to excessive pesticide residues in vegetables.

3. Only cure the table, not cure the problem. The growth of pests and diseases on vegetables is fast, and the farmers are accustomed to not seeing the larvae seriously harming the drug, and failing to grasp the optimal control period of the pests and diseases. For example, the optimal period of control of Plutella xylostella should generally be in the incubation period until the larval two-year age.

4. Blind medication, delay the best prevention time. With the increase in the sales point of pesticides, some procurement personnel who do not understand the technology often take the test as the principle. The effect of the A drug is not good, and then the drug is replaced, which delays the best time for the prevention and treatment of the larva before the third age. In addition, many vegetable farmers look at other people's medication, no matter what the effect, as long as others buy what kind of medicine, everyone will follow the purchase, the effect is not good, and then buy again, did not do the right medicine. This not only delays the optimal control period, but also increases the cost of prevention.

5. The mixture of pesticides is not scientific. Because most vegetable farmers grow a large area of ​​vegetables, in order to save labor and labor, some farmers use all kinds of pesticides, fungicides and plant growth regulators, and mistakenly think that the more types of mixed drugs, The higher the concentration, the better the effect, resulting in phytotoxicity in many plots. Finally, I had to buy a drug that was remedy for remediation. In this way, the optimal control period is delayed, and the cost of prevention is also increased.

Therefore, it is the key to improve the use of pesticides and improve the use of pesticides. It is necessary to use a spray machine with a small fog point to improve the effective utilization rate of pesticides. Some pests like to inhabit the heart and leaves of vegetables, so the spray can be even and thoughtful to achieve the control effect. At the same time, for the cabbages with more waxy leaves, 0.1% washing powder should be added as the adhesive in the liquid.

Therefore, when using pesticides to control pests and diseases, vegetable farmers must pay attention to safe, reasonable and scientific use. It is important to grasp the best prevention and treatment period of pests and diseases. This can not only receive the control effect, but also reduce the number of medications and save manpower.

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