Proper use of chlorbenzuron pesticides
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In the early larval stage of insects, the effect of the drug is the best. The older the insect, the greater the lethal dose of the drug, and the worse the control effect. Therefore, the best period of use for the control of golden mosquito moths is the wintering adult and the adult larvae of the first to second generation larvae, and wait until the leaf miner, leaf curler, and heartworm enter the leaves, drill into the fruit or form a package. After being sprayed again, the effect will be worse. It will be more difficult to prevent and control when the generations cross. It is necessary to "medicate and eat insects" and not to "see the insects".
2, spray, highlight a "even" word
The insecticidal mechanism of the chlorfenapyr insecticide is to inhibit the chitin synthesis of the insect epidermis, so that after the pest larvae take the medicine, the new epidermis cannot be formed, and the skin can be removed without leaving the skin. It is mainly a stomach poisoning effect, and can also invade the epidermis of insects and eggs, but has no systemic action. Therefore, it is necessary to let the insects eat before they are effective. Eggs of the golden mosquito moth are produced on the back of the leaf, and the first-instar larvae bite into the leaf from the back of the leaf. If the spray cannot be sprayed on the back of the leaf, the control effect is very poor. In terms of control effect, the killing effect of chlorhexidine and urea is better than that of chlorfenapyr. Spraying on the back of the plant leaves, the newly produced eggs of the golden mosquito moth will die, and the unhatched eggs will also die, so the spray must emphasize a "even" word.
3, concentration, emphasizing a "quasi" word
Although it is a highly effective and safe insecticide, it is insoluble in water and has very low solubility in most organic solvents. It is difficult to process into emulsifiable concentrate or ultra-low oil. At present, the chlorfenapyr and triflumuron on the market are mostly suspending agents. When using, the bottle should be shaken first, first diluted with a small amount of water, then added with water to the required concentration, and then sprayed. If the spray concentration is too high and the droplets are too large, it will have a repellent effect on the pests. For the 25% chlorfenapyr suspension, it is generally preferred to spray 1500 times.
4, mixed use, taboo an "alkali" word
The chlorfenapyr can not be mixed with the alkaline substance, and the usual acidic or neutral agent can be used with the mixture, and the efficacy is not lowered. When the chlorfenapyr is mixed with other agents, some of the agents may cause cross-resistance to the pests, and some agents can cause it to have negative resistance. The plant synergist has synergistic effect and inhibition. The role of resistance. Adding 300 times of urea solution to the chlorfenapyr will make the droplets smaller and reduce the volatilization rate of the agent by 25%-33%.
5, compounding agent, beware of a "cheat" word
Because the chlorfenapyr is not a quick-acting insecticide, the contact effect is poor and there is no systemic effect. The medicinal effect gradually increases after 3-5 days after application, and some fruit farmers mistakenly believe that the drug effect is not good. Some pesticide manufacturers have mixed the use of chlorbenzuron and quick-acting insecticides, and lost the significance of applying the chlorbenzuron-like agents. Such compounding agents are highly deceptive and should be paid attention to avoid being fooled.
6, safe, the first urea
Diflubenzuron No.3, which has been designated as the chlorfluazuron suspension, its toxicity (acute oral oral administration) ld50>40000 mg/kg, diflubenzuron 3864 mg/kg, and cardinal gram (flufenazone) The toxicity of 3,000 mg/kg and Ticao was 1763-3013 mg/kg. The toxicity of diflubenzuron, carbamide and cytoprotective was 7.62 times, 12.33 times and 12.28-21.69 times higher than that of chlorfenapyr. The US Cyanamide Company requires that the fruit and vegetables should not be used for 70 days before harvesting. Therefore, from the current low-toxic urea agents, the chlorfenapyr suspension has the lowest toxicity, and the chlorfenapyr can be used in the environment. Degradation, no accumulation in the human body, no toxicity to mammals, birds, fish and bees. The efficacy period is more than 30 days, and it is resistant to rain. Therefore, it is necessary to start from the requirements of human and environmental safety and production of green food. Urea is the best choice.
7, taboo
All of the chlorpyrifos pesticides are harmful to the growth and development of shrimp, crab and other crustaceans and silkworms.