Chlorpyrifos is a broad-spectrum organophosphate insecticide with relatively low toxicity. It can protect natural enemies, control underground pests, and has a residual effect of more than 30 days. It disrupts normal nerve impulse transmission by inhibiting the activity of acetylcholinesterase or cholinesterase in the nerves of pests, causing abnormal excitement, spasms, paralysis, and other symptoms of poisoning, ultimately leading to death.
1. Chlorpyrifos spraying
Dilute 48% chlorpyrifos emulsifiable concentrate with water and spray.
(1) Use 800-1000 times dilution to control larvae of American serpentine leafminer, leaf miner, and cabbage leafminer.
(2) Use 1000 times dilution to control larvae of cabbage caterpillar, beet armyworm, lamprey, melon leafminer, and aquatic stem borers.
2. Chlorpyrifos root drenching
Dilute 48% chlorpyrifos emulsifiable concentrate with water and drench the roots.
(1) Apply 3.75–5.63 liters of emulsifiable concentrate per hectare with irrigation water to control root maggots.
(2) Apply a 2000-fold dilution to the plant roots by watering to control earthworm infestation. Use 3750–4500 liters of solution per hectare.
3. Chlorpyrifos soil treatment
Apply 30–60 kg of 3% chlorpyrifos granules per hectare in furrows, holes, or by broadcasting before sowing or transplanting to control leek maggots, grubs, cutworms, etc.
