Pesticide databasePlant growth regulatorsChecked 2026-10-01
Maleic hydrazide マレイン酸ヒドラジド
Plant growth regulators: Gibberellin (for seedless grapes), ethephon (to speed up ripening) and others.
In Japan
- Registration
- Registered as a pesticide (first registered February 8, 1978). 1 formulated product contain it.
- Main registered crops
- tobacco and others (1 crop names in the registered uses)
- Toxicity class
- Active ingredient: Ordinary substanceClasses of the 1 formulated products (diluted products sold): ordinary substance 1Classes under Japan's Poisonous and Deleterious Substances Control Act.
- ADI (acceptable daily intake)
- 0.25 mg per kg of body weight per day
- Evaluation
- Food Safety Commission of Japan, September 18, 2003
- Note
- Not listed in the DB (as of March 31, 2025). The values are from the summary on the evaluation report detail page.
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.
Evaluations abroad
- WHO acute toxicity class
- U (Unlikely to present acute hazard in normal use), LD50 6950 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 October 2032)EU ADI: 0.25 mg/kg bw/day; ARfD: —
- 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)
- Food Safety Commission of Japan, risk assessment report on Maleic hydrazide (September 18, 2003) (Japanese)
- WHO Recommended Classification of Pesticides by Hazard 2019
- EU Pesticides Database (Maleic hydrazide)
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.
Pesticides registered in Japan are approved by the government with set crops, amounts, numbers of applications and days before harvest. This page lists facts stated in laws and in evaluations by public bodies; it does not judge whether anything is good or bad.