Lufenuron is a benzoylurea insecticide; chlorfenapyr is a pyrrole insecticide and acaricide; indoxacarb is an oxadiazine insecticide. The three have their own insecticidal effects. This article briefly analyzes and compares the three ingredients from the following aspects to provide some references for product selection.
1. Insecticide method
Lufenuron has stomach poison and contact killing effects, no systemic absorption, and strong egg killing; chlorfenapyr has stomach poison and contact killing effects, has a certain systemic effect, and does not kill eggs; indoxacarb has stomach poison and contact killing effects, has no systemic effect, and does not kill eggs; all three are mainly stomach poison and contact killing, and adding penetrants or extenders when applying the pesticide will greatly improve the killing effect.
2. Insecticide spectrum
Lufenapyr is mainly used to control leaf rollers, diamondback moths, cabbage worms, beet armyworms, armyworms, whiteflies, thrips, rust ticks and other pests, and is particularly effective in controlling rice leaf rollers; chlorfenapyr has excellent control effects on boring, sucking and chewing pests and mites, especially against resistant pests such as diamondback moths, beet armyworms, armyworms, leaf rollers, American leafminers, bean pod borers, thrips, and red spiders; indoxacarb is mainly used to control beet armyworms, diamondback moths, cabbage worms, armyworms, cotton bollworms, tobacco budworms, and leaf rollers. - So the comparison of insecticide spectrum is: chlorfenapyr>lufenapyr>indoxacarb
3. Speed of insect death
After the insects contact the pesticide and feed on the leaves with the pesticide, their mouths are anesthetized within 2 hours, and they stop feeding, thus stopping harming the crops, and the peak of insect death is reached in 3-5 days; 1 hour after chlorfenapyr is sprayed, the insects become less active, spots appear, the color changes, the activities stop, they become comatose, and limp, and eventually die, and the peak of insect death is reached in 24 hours; within 0-4 hours after indoxacarb, the insects stop feeding and are immediately paralyzed, and the insects' coordination ability will decrease (which may cause the larvae to fall from the crops), and they usually die within 1-3 days after the application of the pesticide. So the comparison of insecticidal speed is: chlorfenapyr>indoxacarb>lumefantrine.
4. Duration of effect
Lufenuron has a strong egg-killing effect, and the insect control time is relatively long, up to 25 days; chlorfenapyr does not kill eggs, but only has outstanding control effect on old insects, and the insect control time is about 7-10 days; indoxacarb does not kill eggs, but kills all lepidopteran pests, and the control effect is about 12-15 days. So the comparison of the duration of effect is: lufenuron>indoxacarb>chlorfenapyr.
5. Leaf retention rate
The ultimate goal of insecticide is to prevent pests from harming crops. As for whether the pests die quickly or slowly or more or less, it is just a matter of perception of the people. The leaf retention rate is the ultimate indicator to measure the value of the product. Comparing the control effect of rice leaf roller, the leaf preservation rate of lufenuron can reach more than 90%, indoxacarb reaches 80%, and chlorfenapyr reaches about 65%; so the comparison of leaf preservation rate is: lufenuron>indoxacarb>chlorfenapyr.
6. Safety
So far, there has been no phytotoxicity response to lufenuron, and the agent will not cause the piercing-sucking pests to become rampant again, and it has a mild effect on the adults of beneficial insects and predatory spiders; chlorfenapyr is sensitive to cruciferous vegetables and melon crops, and is prone to phytotoxicity when used at high temperatures or high doses; indoxacarb is highly safe, with no phytotoxicity response, and vegetables or fruits can be picked and eaten the next day after application. So the comparison in terms of safety is: indoxacarb>lufenuron>chlorfenapyr.
7. Drug cost
The comparison of drug cost is: indoxacarb>chlorfenapyr>lufenuron. To evaluate the overall feeling of the three in actual use in one sentence: Lufenuron feels very effective when used for the first time, but feels very effective after using it twice in a row; chlorfenapyr, on the contrary, feels very effective when used for the first time, but feels very ordinary after using it twice in a row; the effect of indoxacarb is roughly in between the two.
