In recent years, the problem of pesticide pollution has become more and more serious. It is urgent to find green environmental protection substitutes. Biological pesticides have emerged as the times require, and they are widely concerned and welcomed by people. What are the common types of biological pesticides? What is the correct use of biological pesticides? Let's follow the Xiaobian to understand it.
First, common biological pesticide varieties
1. Bacillus subtilis: increase crop stress resistance and nitrogen fixation.
2, Bacillus megaterium: phosphate (phosphorus bacteria), has a good effect of degrading organic phosphorus in the soil.
3, Bacillus licheniformis: potassium, release soluble phosphorus and potassium elements and calcium, sulfur, magnesium, iron, zinc, molybdenum, manganese and other trace elements.
4, Bacillus licheniformis: disease resistance, kill harmful bacteria.
5. Bacillus thuringiensis: insecticidal (including root-knot nematodes), specific to the arthropods such as lepidoptera.
6, Bacillus licheniformis: promote roots, sterilize and degrade heavy metals,
7. Bacillus licheniformis: It has the functions of dissolving phosphorus, releasing potassium and fixing nitrogen, secreting various enzymes and enhancing the resistance of crops to some diseases.
8. Streptomyces sp.: It has the ability to enhance soil fertility and stimulate crop growth.
9. Mycorrhizal fungi: enlarge the root absorption surface and increase the absorption capacity of elements (especially phosphorus) outside the original root hair absorption range.
10, brown nitrogen-fixing bacteria: fixed air in the free nitrogen, increase production.
11. Photosynthetic bacteria: It is the main force for fertile soil and the growth of animals and plants.
12. Bacillus coagulans: It can reduce harmful gases such as ammonia and hydrogen sulfide in the environment. Increase the content of amino acids in the fruit.
13. Aspergillus oryzae: Makes the organic matter in the straw the nutrients needed for plant growth, improves the soil organic matter, and improves the soil structure.
14. Paecilomyces lilacin: It has the control effect on a variety of nematodes, and is the most promising biocontrol agent for controlling root-knot nematodes.
More than three kinds of compound bacteria promote each other and complement each other, and the effect of resisting soil-borne diseases is far greater than that of single strains. The beneficial bacteria cooperate with each other and work together to achieve high yield and high yield.
Second, the correct use of biological pesticides
1 Grasp the temperature.
When spraying bio-pesticide, it must be controlled at an ideal temperature above 20 °C. The secret is that the active ingredient of this kind of pesticide is composed of protein crystals and living spores. Once sprayed below the above temperature, then The rate of propagation of spores in the body of the pest is very slow and the protein crystals are difficult to exert their effects, often showing no control effect after application. According to the experimental data, the bio-pesticides after spraying are 1-2 times higher than the insecticidal efficiency between 10 and 15 °C between the conditions of 25-30 °C.
2 Do not use in dry weather.
Biological pesticides are also extremely sensitive to humidity requirements. The greater the environmental humidity, the more significant the efficacy of spraying biological pesticides, especially for powdered biological pesticides.
3 Avoid the sun.
Ultraviolet light in the sun has a lethal killing effect on spores. Scientific experiments have shown that direct sunlight for 30 minutes will kill spores by 50% in one fell swoop. After one hour of irradiation, the spore mortality rate is as high as 80%. Therefore, the application time is on a cloudy day or after four in the afternoon.
4 After use, fear of heavy rain wash.
Spores are most afraid of heavy rain, so it should be carried out according to the weather forecast, because the rain will wash away the sprayed bacteria and lose the lethality.
5 bogey mixed with fungicides.
More pesticide knowledge, please pay attention to China Pesticide Network
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