1. Liquid spraying
As the most widely used method in production currently, it is to spray the liquid medicine evenly on the control object and the protected host plant by means of spray equipment. And dosage forms for liquid spraying include emulsifiable concentrate, wettable powder, soluble powder, colloidal suspension, etc. Since the droplet size will affect the prevention and control effect, generally, it is preferable to spray with the ground spray diameter between 50-80μm, uniformly and thoroughly. Better not to spray at noon in case of drug damage and human poisoning.
2. Powder spraying
Powder spraying is a method that it is to uniformly spray powder on target plants using wind power generated by powder spraying equipment. This method is most suitable for drought areas with water shortage. The dosage form suitable for powder spraying is powder. The disadvantages of this method are high consumption and poor adhesion of powder, not as good as emulsifiable concentrate and wettable powder in terms of effect, and easy to be blown away by wind and washed by rain, thus polluting the environment. Therefore, powder spraying is suitable for morning and evening when there is dew on the leaf surface or when the leaf surface is wet and there is just breezing after rain so that the powder is easy to deposit and adhere on the leaf surface, improving the prevention effect.
3. Soil treatment
It is to mix the medicine powder with fine soil, fine sand and furnace ash, etc. and spread the mixture on the ground, and then plough and plow. It is mainly used for preventing and controlling underground pests or insects moving on the ground in a certain period of time. For example, toxic soil can be made by mixing 1 part of 5% phoxim particles with 50 parts of fine soil.
4. Seed dressing and soaking or seedlings soaking and seed smothering
Seed dressing refers to evenly mixing a certain amount of medicinal powder or liquid with seeds before sowing to prevent seed-borne diseases and underground pests. The dosage for seed dressing is generally 0.2%-0.5% of the weight of the seed. Soaking seeds or seedlings is to soak the seeds or seedlings in a certain concentration of liquid medicine to eliminate germs or worms in seed seedlings. Seed smothering is to spread seeds on the ground, evenly spray the diluted liquid medicine on the seeds and stir them evenly, then piled up the seeds for fumigation and cover them with sacks and other materials, and dry them after a period of time.
5. Poison grain and poison bait
Poison bait are made by mixing the bait that pests like to eat with pesticide to induce pests to come for eating and produce stomach toxicity to kill them. Common baits include wheat bran, rice bran, bean cake, peanut cake, corn cob, vegetable leaf, etc. Evenly mix the bait with stomach poisons such as trichlorfon and phoxim, and spread them in places where pests are active. It is mainly used to prevent and control underground pests such as mole cricket, cutworm, cricket. Poison grain refers to grains such as millet, sorghum, corn as bait, and when they are cooked to a certain fragrance, take them out to dry and mix them with stomach poison. Then sow them with seeds or scatter them on the ground.
Fumigation is a method that it is to use toxic gases to kill pests or germs. Generally, it should be carried out under closed conditions mainly used for preventing and controlling pests on greenhouses, warehouses, stem borers and seedlings. For example, zinc phosphide is used to fumigate larvae of longicorn beetles and dichlorvos is used to fumigate aphids in greenhouses.