Chlorfluazuron 95% TC Insecticide

Parameters of chlorfluazuron

Basic Chemical Properties

Chlorfluazuron has the CAS number 71422-67-8, a molecular formula of C₂₀H₉Cl₃F₅N₃O₃, and a molecular weight of 540.65 g/mol.
The pure product appears as a white to yellowish-white crystalline powder with a density of approximately 1.5-1.6 g/cm³. This compound has a very low solubility in water (0.016 mg/L) but is readily soluble in organic solvents such as acetone, dimethyl sulfoxide (DMSO), and dimethylformamide.

Mechanism of Action

Chlorfenapyr inhibits the activity of chitin synthase in the insect cuticle, hindering the molting process of larvae, preventing the formation of a new cuticle and causing death. It acts primarily as a stomach poison, with some contact effects, but is not systemic or penetrating. This non-neurotoxic mechanism remains highly effective against pests resistant to organophosphate and pyrethroid insecticides. While its effectiveness is slow to develop (usually within 5-7 days), it remains effective for a long time.

Main Targets

This agent primarily targets Lepidoptera pests (such as diamondback moth, cabbage worm, and cotton bollworm), Diptera and Orthoptera pests (such as leafminers and white grubs), and is also effective against Coleoptera and Hymenoptera pests. However, it is ineffective against aphids, whiteflies, and thrips. Suitable crops include vegetables (cabbage, beans, and tomatoes), cotton, fruit trees (citrus, apples, and pears), and tea trees.

Application Method

Chlorfluanid is commonly used in a 5% emulsifiable concentrate (EC). It is recommended to dilute the solution 1500-4000 times for foliar spraying. The optimal application period is when the insect eggs are hatching or the young larvae are in the 1st to 3rd instar stage. Applications should be made up to three times per season, with at least 7 days between applications. When controlling diamondback moths or cabbage loopers, the concentration should be adjusted based on the severity of the infestation (use a 4000-fold dilution for light infestations and a 1500-2000-fold dilution for heavy infestations).

Toxicological Data

Chlorfenapyr has low toxicity to humans and animals: the acute oral LD₅₀ in rats is >8500 mg/kg, and the acute dermal LD₅₀ is >1000 mg/kg. It is not teratogenic or mutagenic. However, it is highly toxic to silkworms (LC₅₀ is 0.15 mg/L), so its use should be strictly avoided in mulberry orchards. It has low toxicity to fish and bees, but caution is still advised with aquatic organisms.