Tefluthrin テフルトリン
Pyrethroids: Developed from a component of pyrethrum flowers (pyrethrin). They act on the sodium channels of nerves.
In Japan
- Registration
- Registered as a pesticide (first registered April 28, 1993). 2 formulated products contain it.
- Main registered crops
- ume (Japanese apricot), sweet potato, taro, mountain yam, peanut, cabbage and others (34 crop names in the registered uses)
- Toxicity class
- Active ingredient: Poisonous (deleterious at 0.5% or less)Classes of the 2 formulated products (diluted products sold): deleterious substance 2Classes under Japan's Poisonous and Deleterious Substances Control Act.
- ADI (acceptable daily intake)
- No risk assessment report by the Food Safety Commission of Japan was found
ADI: the amount considered to have no effect on health even if eaten every day for a lifetime. ARfD: the amount considered to have no effect on health when eaten at one time (within 24 hours). Both are set by the Food Safety Commission of Japan, mainly from animal studies.
In Japan's national residue testing (fiscal 2024)
| Produce | Detected / tested | Detection rate | Over the limit |
|---|---|---|---|
| Domestic | 22 / 4,771 | 0.5% | 0 |
| Imported | 0 / 1,159 | 0.0% | 0 |
Found in domestic foods: turnip roots, sweet potato, komatsuna (Japanese mustard spinach), daikon-type roots (including radish), spinach, lettuce (including butterhead and chisha lettuce) (max. 0.06 ppm)
Tests are counted as pesticide × sample. Any detection counts as “detected” — it does not mean the limit was exceeded. For pesticides outside the top 20, figures are summed from the food-by-food tables of the full report.
Evaluations abroad
- WHO acute toxicity class
- Ib (Highly hazardous), LD50 c22 mg/kgBased on the toxicity of the undiluted active ingredient given once, mainly to rats by mouth (LD50 = the dose that kills half; the smaller, the stronger the acute toxicity). It is not an assessment of the safety of residues in food.
- EU
- Approved in the EU (approval expires May 2027)EU ADI: 0.005 mg/kg bw/day; ARfD: 0.005 mg/kg bw
- IARC (carcinogenicity)
- No matching entry in the IARC list (not evaluated or out of scope, including Group 3)
Related explainers
Sources
- FAMIC (Food and Agricultural Materials Inspection Center), pesticide registration information (as of Sept. 30, 2026) (Japanese)
- MHLW, results of pesticide residue testing in foods, fiscal 2024 (Japanese)
- WHO Recommended Classification of Pesticides by Hazard 2019
- EU Pesticides Database (Tefluthrin)
Last checked 2026-10-01. Registrations and evaluations change over time. This page is a translation of our Japanese page; if they differ, the Japanese page is the reference.