After the use of insecticides, it is necessary to enter the pest to reach the site of action before it can exert its insecticidal effect. But different pesticides reach the pests in different ways. Therefore, only by fully understanding the characteristics and living habits of pests themselves, as well as mastering the knowledge of insecticides, can we use the correct pesticide formulation for pests in the process of chemical control.
1, underground pests: underground pests due to their special pest parts, mainly in the soil or soil surface life, after application to consider the combination of pesticides and soil particles, some pesticides and soil after the combination of insecticidal effect, so the choice of insecticide ingredients is very critical, because some pesticides will be combined with soil particles after application and invalid.
2, chewable mouthpart pests: this kind of mouth organ pests must eat plant leaves or other tissues when harming crops, causing damage such as leaf lack.
3, mesozoic insects: insecticides with touch killing effect, mainly through the surface of the pest into the body, so the body wall structure of the pest is characterized by affecting the play of the touch killer effect. The waxy and lipid compounds contained in the epidermis on the wall of the pest body have no affinity with water, so the insect epidermis is usually not wet with water, and when the insecticide is diluted and sprayed on the insect body, the liquid will accumulate into a spherical shape and roll off the surface of the insect body.
4. Homoptera (cicadas, lice, aphids, aphids): methylvid salt is 10-100 times higher than avermectin insecticidal, acaricide and nematode activity, and the insecticidal spectrum is broadened; gastric toxicity is mainly both touch killing; pests occur irreversible paralysis, stop eating, 2-4 days before death, insecticidal speed is slower; long effectiveness, pests are 10-15 days, mites are 15-25 days.
5. Hemiptera (bugs): imidacloprid: nicotinic; touch killing, gastric poisoning and internal suction; pest paralysis and death; good quick-activism, 1 day has a high prevention effect, the residual period is up to 25 days; the temperature is high And the insecticidal effect is good; the stinging mouthpiece pest is easy to be absorbed by crops and distributed to the top, and has a root suction effect.
6. Diptera (fly mosquitoes): Malathion: when the temperature is low, the virulence decreases, and the dosage or concentration of the drug can be appropriately increased; the chewable mouthpiece and the sucking mouthpiece pest; the touch killing and gastric toxicity, a certain fumigation and osmotic effect; the knocking force on the pests is strong, the effect is good at high temperature; the residual period is short; some varieties such as sorghum, melon beans and pears, grapes, and cherries are prone to drug damage and should be used with caution; stop using it 10 days before fruit picking.
7. Taenoptera (thrips): Urea: the drug is used in the early larval stage, the older the insect age, the worse the prevention effect. Inhibition of chitin synthesis, gastric toxicity, can invade the epidermis of insects and eggs, but no systemic effect; spraying on the back of plant leaves; efficacy of more than 30 days, resistant to rain erosion; safe against natural enemies, high activity against Lepidoptera and mosquito larvae; death begins to die 3 days after the drug, 5 days to reach the peak of death; ineffective for adult insects.
8. Hymenoptera (leaf bees, stem bees): insecticidal, mite-killing effect, gastric toxicity and touch killing, no systemic and fumigation properties; good permeability, certain egg killing effect, fast degradation speed on plants, short residual effect; good anti-chewing and sucking pest effect.
9. Orthoptera (locusts, crickets, caddisflies): Thiazide: inhibit chitin synthesis and interfere with metabolism; 3-7 days after the drug can be effective, there is no direct lethality to adults, but it can shorten their lifespan, reduce egg production, and produce mostly sterile eggs, and the larvae die quickly even if they hatch. It has a good control effect on hemiptera planthoppers, leafhoppers, whiteflies and mesenchymal pests, with a medicinal effect period of more than 30 days; it cannot be used by poisonous soil method; it is not suitable for direct contact with cabbage and radish, otherwise brown spots and green leafiness will appear.
10. Lepidoptera (moths and butterflies): Isopropylvir: touch killing, has a certain penetration and conduction activity, and has strong quick-acting; mainly used for rice control of rice planthoppers and leafhoppers, and can also smelt thrips; can not be used at the same time as the enemy barnyard, must be spaced for more than 10 days; the agent is harmful to taro and should not be used.
11. Coleoptera (beetles): Bacillus thuringiensis: bacterial; gastric toxicity, the production of bacterial toxins; the medicinal effect is slower; the residual effect period is about 10 days; the higher the temperature, the more you eat, the better the effect; the larvae of lepidopteran pests such as vegetable green insects, small cabbage moths, twill moths, beet noctuidae moths, silver moths and other lepidopteran pests; more than 30 °C can play an insecticidal effect; use 2 to 3 days in advance. For more practical techniques, please click the "Follow" button in the upper right corner!