Fludioxonil フルジオキソニル
Dicarboximides and others: Classes used against gray mold and similar diseases (procymidone, iprodione, fludioxonil and others).
In Japan
- Registration
- Registered as a pesticide (first registered October 29, 1996). 15 formulated products contain it.
- Main registered crops
- rice (paddy), tomato, cabbage, potato, onion, spinach and others (51 crop names in the registered uses)
- Toxicity class
- Active ingredient: Ordinary substanceClasses of the 15 formulated products (diluted products sold): ordinary substance 15Classes under Japan's Poisonous and Deleterious Substances Control Act.
- ADI (acceptable daily intake)
- 0.33 mg per kg of body weight per day
- ARfD (acute reference dose)
- 2.5 mg per kg of body weight
- Evaluation
- Food Safety Commission of Japan, May 31, 2022
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 | 44 / 3,238 | 1.4% | 0 |
| ImportedNo. 2 by detection rate | 194 / 1,439 | 13.5% | 0 |
Found in domestic foods: strawberry, cucumber (including gherkin), other Asteraceae vegetables, eggplant, nira (garlic chives), carrot, Welsh onion (including leek), grape, tomato, bell pepper, adzuki-type beans (max. 0.7 ppm)
Found in imported foods: strawberry, cherry (including cherries), grape, orange (including navel orange), grapefruit, tomato, bell pepper, blueberry, lime, raspberry, lemon (max. 3.9 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
- U (Unlikely to present acute hazard in normal use), LD50 >5000 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 September 2027)Designated a “candidate for substitution” (to be replaced if safer alternatives exist).EU ADI: 0.37 mg/kg bw/day; ARfD: —
- IARC (carcinogenicity)
- No matching entry in the IARC list (not evaluated or out of scope, including Group 3)
Good to know
- In Japan, it is treated in two ways: as a pesticide if used in the field, and as a food additive (fungicide) if used after harvest. It is found at a high rate in imported produce (MHLW, fiscal 2024: 194 of 1,439 samples, 13.5%).
Related explainers
Sources
- FAMIC (Food and Agricultural Materials Inspection Center), pesticide registration information (as of Sept. 30, 2026) (Japanese)
- Food Safety Commission of Japan, risk assessment report on Fludioxonil (May 31, 2022) (Japanese)
- MHLW, results of pesticide residue testing in foods, fiscal 2024 (Japanese)
- WHO Recommended Classification of Pesticides by Hazard 2019
- EU Pesticides Database (Fludioxonil)
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.