Pesticide application technology of pollution-free vegetables

1. an antidote against the disease. On the basis of fully understanding the performance and usage of pesticides, according to the types of diseases and insect pests, choose the appropriate pesticide type or dosage form and the appropriate concentration, do not artificially increase the concentration.

two。 Take the medicine at the right time. According to the law of the occurrence of diseases and insect pests, strictly grasp the best control period, to achieve timely use of drugs. It is required to control the disease at the initial stage of the disease, control the disease center and prevent its spread and development, once the disease occurs and spreads in large quantities, it is difficult to control; the role of biological pesticides is slow, and the use of biological pesticides should be 2-3 days earlier than chemical pesticides.

3. Scientific use of medicine. Attention should be paid to the alternate use of pesticides with different action mechanisms, which can not be unitary for a long time to prevent pathogens or pests from producing drug resistance, which is conducive to maintaining the control effect and service life of pesticides. In the early growth stage, the vegetables were mainly mixed or alternately used with chemical pesticides and biological pesticides with high efficiency and low toxicity, and in the later growth stage, biological pesticides were mainly used. Low-volume spraying should be promoted in the use of pesticides, and attention should be paid to uniform spraying.

4. Select the correct spraying point or location. According to the occurrence characteristics of different diseases and insect pests in different periods, different parts of the plant were selected as targets for targeted application. To achieve the purpose of controlling the occurrence of diseases and insect pests in time, reducing pathogens and depressing insect population density, so as to reduce the use of drugs. For example, the occurrence of downy mildew begins to develop upward from the lower leaves, and the focus of early prevention and control of downy mildew is on the lower leaves, which can reduce the infection of the upper leaves.

5. Mix medicament reasonably. The mixed application method was adopted to achieve the purpose of controlling the harm of many kinds of diseases and insect pests at one time. However, the premise of pesticide mixing is to maintain the original active ingredients or have synergistic effect, not to increase the toxicity to humans and animals and to have good physical fusion. In general, neutral pesticides can be mixed; neutral pesticides and acid pesticides can be mixed; acid pesticides can be mixed; basic pesticides can not be mixed with other pesticides; microbial pesticides (such as Bt) can not be mixed with fungicides and strong internal absorption pesticides; mixed pesticides should be used whenever possible.

6. The pesticide safety interval should be carried out strictly in accordance with the time limit. The safety intervals of pyrethroids pesticides, organophosphorus pesticides, chlorothalonil, zinc benzoate and carbendazim were 5-7 days, 7-14 days, 14 days and 7-10 days respectively. Pesticide mixtures carry out safe intervals for the most residual active ingredients.