1. Pursuit of quick-impactness. When selecting pesticides , vegetable farmers always like to choose quick-acting, because the quick-acting pesticides show their effects soon after they are used. The vegetable farmers hope to kill the pests immediately after spraying. Although some pesticides work well, such as bio-pesticide BT or avermectin insecticides , it is not easy to show the effect due to slow effect after use, and the vegetable farmers have low recognition. This is also a high-toxic pesticide that cannot be completely banned from biological pesticides. One of the reasons for the slow application speed.
2. Blindly pursue new differences.
At present, there are many kinds of pesticides on the market, and there are some pesticides with incomplete "three certificates". Some farmers prefer to use newer pesticides. Although the use of new pesticides can prevent the resistance of certain pests and diseases, many pesticides are mainly used as a compounding agent, which will increase the amount of use and cause phytotoxicity. At the same time, some pesticides have not been tested and promoted, and their effects are not well understood, and problems are prone to occur.
3. Too much belief in the propaganda efficacy of certain pesticides. Many pesticides have a scope of application. When purchasing pesticides, they will be bought and used as long as they are marked. If some pesticides are indicated to cure fungi, bacteria, viruses and other diseases, they will be purchased as good pesticides.
4. Excessive application. Many vegetable farmers use pesticides excessively. When using pesticides, the dosage is several times or even ten times that of common drugs, which often causes phytotoxicity and even poisoning accidents.
5. Improper use. "There is no panacea in the world". When using it, it is necessary to clarify the target of prevention and control, prevent key periods, and not pay attention to the changes of the weather. Do not choose the appropriate medicine, do not pay attention to the method of medicine and dilution, freely dispense medicine, and not evenly and thoughtfully. Spraying affects the effect of medication, causing unnecessary waste and environmental pollution.
6. Can not prescribe the right medicine.
This is a common problem in the current vegetable production. Many vegetable farmers lack the necessary knowledge of plant protection , and cannot diagnose correctly after the onset of symptoms. Instead, they can blindly use drugs. Not only can they not treat diseases, but they may aggravate the disease.
7. A variety of pesticides are not mixed properly. At present, there are many varieties of vegetable and agricultural fungicides , insecticides and micro-fertilizers that are unreasonably mixed together, which will affect the efficacy and even cause phytotoxicity.
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