As the seasons change, the temperature rises and the rainfall increases, and various diseases and insect pests on vegetables also occur one after another. 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. Rotate pesticides without planning. Therefore, the pests and diseases become resistant quickly, which affects the control effect of the pesticide.
2, do not pay attention to scientific medication. Did not use the pesticide according to the prescribed dosage, the number of medications, the method of administration and the safe interval, and increased the dose and the number of uses without authorization. It is wrong to think that the larger the dose, the more the use, the shorter the safety interval, and the prevention and control of pests and diseases. The better the effect will be. In fact, it is very easy to produce phytotoxicity, and it will also lead to excessive pesticide residues in vegetables.
3, treatment of the table, not a cure. The diseases and insects on the vegetables are rapidly multiplying, and the vegetable farmers are accustomed to not seeing the larvae seriously harming the medicine, and do not grasp the best 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 pesticide varieties are not scientifically mixed. 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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