Tips for improving the use of microbial pesticides
Microbial pesticides refer to the use of living organisms such as bacteria, fungi, viruses, etc. to prevent, destroy or control one or several harmful organisms that are harmful to agricultural and forestry production. It has the advantages of safety to humans and animals, no pesticide residues, no drug resistance, no pollution to the environment, and is being widely used in the production of pollution-free agricultural products. However, improper storage and use can result in poor application performance. Master points using the following aspects, can improve the control effect of microbial pesticides.
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First, scientific custody. Microbial pesticides are in vivo preparations and must be stored in a closed, low temperature, ventilated, dry place. Can not be mixed with fungicides , antiviral agents and alkaline substances. Otherwise, it is easy to cause the living organism to die and reduce the efficacy.
Second, look at the use of drugs. When the temperature is between 10 and 27 °C, the feed intake and body absorption of the pest increase with the increase of temperature. When the bacterial spore or virus enters the pest body, the breeding is fast and the toxicity is high, which causes the pest to die faster and cause disease. Therefore, bio-pesticides can be significantly improved in cloudy days from May to September or on cloudy days and sunny afternoons.
Third, symptomatic choice of pesticides. The application range of biological pesticides is relatively narrow and has strict selectivity. For example, Chunremycin only controls rice blast, and Lubao No. 1 only controls dodder. Therefore, according to the main pests and diseases that occurred at the time, the symptomatic medication can only achieve the desired results.
Fourth, appropriate medication in advance. After the use of biological pesticides, the control effect is slightly slower than that of chemical pesticides. The pest and disease prediction should be strengthened, and it should be used 3 to 5 days earlier than chemical pesticides. Insecticides are sprayed during the egg hatching period until the larvae age 2, and the fungicide is sprayed at the initial stage of disease, and the disease rate is better.
Fifth, the use of the correct method of application 1. The concentration is appropriate, scientific interval. Bacterial insecticides generally use 2200~2500 grams of bacteria powder per hectare with a number of live spores of 10 billion/g. The population of insects is large, the generations overlap, the age of the insects is uneven, the dosage per unit area is large, and the interval is short. Bacillus thuringiensis is used to control Plutella xylostella, and the cabbage butterfly is separated by 10 to 15 days, and the prevention and treatment of T. chinensis is 5 to 6 days apart. 2. Spray evenly. Biological pesticides are generally based on stomach poisoning, and uniform spraying can improve the control effect. Before using the powder, weigh the amount of the drug, add a small amount of water to make a paste, and then add the required amount of water; shake the emulsion thoroughly before use, according to the amount of water per hectare to enter the required amount of water 750~1000 kg, stir well can. Adding 0.1% detergent powder, saponin or tea powder to the solution as an adhesive is beneficial to improve the spraying effect. 3. Properly formulated and mixed. Bio-pesticide insecticide and disease prevention are highly targeted, and pesticide compounding can expand the scope of application and improve drug efficacy, especially when gluttony pests are involved in disasters. However, it should not be mixed with alkaline pesticides or systemic organophosphorus pesticides. It is forbidden to mix with fungicides and antiviral agents. When the formula is mixed, it should be used as needed, and it should not be put on for a long time.
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