Pyrethrins

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Chemical Identification | General Product Information | Physical & Safety Data

Chemical Identification

Common Name

Pyrethrins

中文通用名

除虫菊素

CAS No.

8003-34-7

Molecular Structure

General Product Information

Category

Insecticides > Bioinsecticide
Botanical pesticide > Botanical pesticide

Activity

Insecticide

Premix

Pyrethrins+Azadirachtin
PIPERONYL BUTOXIDE+PYRETHRINS
Concentrate in oil and water, usually containing synergists; in impregnated and stabilized dust concentrates; in dilute dusts made from ground flowers. In recent years a low-color, 20% pyrethrin extract in oil has become the "standard" item of the industry, although less concentrated solutions in oil are still available.
Premix Parters: carbosulfan; imidacloprid; sulfur;

Physical & Safety Data

Physical Properties

Botanical insecticide whose active principles are pyrethrins I and II (esters of pyrethrolone and chrysanthemic acid and pyrethroic acid), cinerins I and II (esters of cinerolone and chrysanthemic and pyrethroic acids), and jasmolin I and II (jasmoline and chrysanthemic and pyrethroic acids), collectively known as the "pyrethrins." The plant Chrysanthemum cinerariaefolium, and the flowers are the source of the principles. The flowers and extracts are principally imported from Kenya, Rwanda, Tanzania, and Ecuador. Pyrethrum dried flowers contain 0.9-1.3% pyrethrins. The crude extract or oleoresin contains 50-60% pyrethrins and most refined grade (pale) about 50% (20% in U.S.) pyrethrins by dewaxing and decoloring. Formerly the dried flowers were known as Dalmatian insect flowers; the powdered flowers as "insect powder.".

Toxicology

Oral:Acute oral LD₅₀ for male rats 2370, female rats 1030, mice 273-796 mg/ kg. Percutaneous:Acute percutaneous LD₅₀ for rats >1500, rabbits 5000 mg/kg. Slightly irritating to skin and eyes. Constituents of the flowers may cause dermatitis to sensitised individuals, but are removed during the preparati Inhalation: LC₅₀ (4 h) for rats 3.4 mg/l.

Environmental Profile

Ecotoxicology:
Bees:Toxic to bees, but exhibits a repellent effect. LD₅₀ (oral) 22 ng/bee; (contact) 130-290 ng/bee.Birds:Acute oral LD₅₀ for mallard ducks >10 000 mg/ kg.Daphnia: LC₅₀ 12µg/l.Fish:Highly toxic to fish. LC₅₀ (96 h) (static tests) for coho salmon 39, channel catfish 114 mg/l. LC₅₀ for bluegill sunfish 10, rainbow trout 5.2µg/l.

Environmental fate:
Animals:In mammals, rapidly degraded in the stomach by hydrolysis of the ester bond to harmless metabolites. For details, see T. J. Class et al., J. Agric. Food Chem., 1990, 38, 529.Soil:In the environment, degradation, promoted by sunlight and u.v. light, begins at the alcohol group and involves the formation of numerous unknown cleavage products. WATER SOLUBILITY: Soluble

Transport Information

Signal Word:CAUTION; Hazard Class:II(Moderately hazardous)