Everyone knows that in crop planting, if you want crops to grow well, the use of pesticides and fertilizers is inevitable, but you must understand the medicinal properties and methods of use of pesticides, otherwise it will cause serious phytotoxicity affecting crop growth. The following small series will explain in detail the role and harm of common insecticides.
Insecticide mode
Urea urea has stomach poisoning and contact killing effect, no systemic absorption, strong egg killing; insect nitrile has stomach poisoning and contact killing effect, has certain systemic action, does not kill eggs; indoxacarb has stomach poisoning and contact killing effect, no Systemic action, no egg killing; all three are mainly stomach poisoning and contact killing, and the application of penetrant/expanding agent during application will greatly improve the killing effect.
Insecticidal spectrum
Urushiurea is mainly used to control pests such as leafhopper, diamondback moth, and cabbage caterpillar, especially in the control of rice leaf roller; insect nitrile is excellent for drill collar, sucking and chewing pests and mites. The control effect is especially effective for Plutella xylostella and Spodoptera exigua in resistant pests; Indoxacarb is mainly used for controlling beet armyworm, Plutella xylostella, Pieris rapae, Spodoptera litura, Helicoverpa armigera, Tobacco budworm, Leaf roller moth, etc. Hymenoptera pests.
Therefore, according to the insecticidal spectrum, the comparison is: worm nitrile > guanidine urea > indoxacarb
Dead insect speed
Urea urea, after the pests contacted the drug, the mouth was anesthetized within 2 hours, stopping feeding, thus stopping the hazard crop, reaching the peak of dead insects in 3-5 days; the insect activity became weak 1 hour after the insecticidal nitrile was beaten, spots appeared, color Changes, activities stop, coma, soft, eventually leading to death, reaching the peak of dead insects in 24 hours; insects stop feeding after 0-4 hours, and then paralyzed, insect coordination ability will decline (can lead to larvae from Falling on the crop), usually 1-3 days after the drug died.
Therefore, according to the speed of insecticide, it is: worm nitrile > oxadiazepine > guanidine
Effective period
Nicurone has a strong egg-killing effect, and the insect control time is relatively long, up to 25 days; the insect nitrile does not kill eggs, and only has a prominent effect on the advanced insects, and the insect control time is about 7-10 days; Do not kill eggs, the size of the lepidopteran pests, the control effect is about 12-15 days.
Therefore, according to the retention period, the comparison is: guanidinium > indoxacarb > insect nitrile
Leaf retention rate
The ultimate goal of insecticide is to prevent pests from harming crops. As for whether the pests die faster or slower, they are only the sensory problem of the people. The level of leaf retention is the ultimate indicator of product value. In view of the control effect of rice leaf roller, the leaf retention rate of guanidine urea can reach more than 90%, indoxacarb reaches 80%, and worm nitrile reaches about 65%.
Therefore, according to the ratio of leaf retention, it is: guanidinium > carbaryl > chlorfenapyr.
safety
There is no phytotoxicity reaction of guanidine urea so far. At the same time, the medicinal agent does not cause sucking pests to re-sick, and it has mild effect on adult worms and feeding spiders; worm nitrile is sensitive to cruciferous vegetables and melon crops, high temperature Or high-dose use is easy to produce phytotoxicity; indoxacarb is highly safe, there is no phytotoxicity, and the vegetables or fruits can be picked and taken on the second day of application.
So the safety comparison is: 茚虫å¨>虱螨Urea> worm nitrile
Medication cost
Calculated according to the quotation of each manufacturer in 2018 and the dose used,
The cost comparison of medication is: oxadiacarb > chlorfenapyr > guanidine
Planting crops will encounter various pests. If the control is not timely, it will seriously affect the crop yield. Therefore, the use of pesticides is essential, but you can choose to use small pesticides, so that you can eliminate the insects and avoid the medicine. harm. The above is the analysis of the function and function of common drugs. Let's take a quick look.
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