Japan Pesticide Re-Evaluation Support and Registration Maintenance
Every pesticide registered in Japan now carries a re-evaluation deadline, and the timing of everything else you file for that active depends on it. This guide explains the cycle, the published schedule, the four review tracks, what the completed re-evaluations show about duration, and the ongoing obligations that keep a registration alive.
Until 2018 a Japanese pesticide registration, once granted, was maintained by renewal. The amendment that took effect on 1 December 2018 replaced that with a system of periodic re-evaluation against the latest scientific knowledge, applied to every registered pesticide. For products registered after the amendment, the cycle is roughly fifteen years. For the roughly 577 actives already on the register, MAFF set a priority order based on domestic usage and potential effect on health and the environment and began working through it from fiscal 2021 (MAFF, re-evaluation overview).
The schedule is published years ahead
MAFF publishes the actives subject to re-evaluation, by fiscal year, with a data-submission deadline for each, in a notification issued roughly two years in advance. The current list runs through fiscal 2028. Deadlines fall at quarter-ends, four actives a year in the published table, and the early cohorts were the high-volume neonicotinoids and rice herbicides: imidacloprid was due 28 December 2021, acetamiprid 31 March 2022, esprocarb 30 June 2022. The fiscal 2026 cohort is cadusafos (30 June 2026), quizalofop-ethyl (30 September 2026), alanycarb (28 December 2026), and ioxynil (31 March 2027). Fiscal 2027 lists allethrin, isoxaben, 4-CPA, and imazamox; fiscal 2028 opens with DBEDC.
The practical consequence is that the deadline applying to your active is knowable, and so is whether your product is in the queue. A registration holder that has not checked the list is planning blind.
What the completed re-evaluations show
The published standard processing period for a re-evaluation application is twelve months. MAFF also publishes the re-evaluations that have concluded, with the date the new registration certificate was issued, and the two lists can be joined. As of August 2026, seven had concluded: esprocarb, thifluzamide, ferimzone, pentoxazone, butachlor, phenmedipham, and isotianil. Measured from the data-submission deadline to the certificate, they took between 3.5 and 4.0 years, averaging 3.8, and not one finished within the published period. Several of the first-cohort actives with a December 2021 deadline were still in progress four and a half years later.
The reason is structural. A re-evaluation is not one review. MAFF and FAMIC assess efficacy and quality; the Food Safety Commission re-assesses dietary risk and sets the acceptable daily intake and acute reference dose; the Consumer Affairs Agency revisits the residue standards; the Ministry of the Environment assesses effects on organisms in the living environment and on water. The twelve-month period describes one body's target for its own step. The elapsed figure reflects the chain, and it is the number to plan against.
The four review tracks for anything else you file
Filing a change registration or a new formulation for an active under re-evaluation is permitted, and how it is reviewed is fixed by MAFF Notice 4177 (Pesticide Control Office, 25 December 2019, amended 1 April 2025). One variable decides the track: where your filing date falls relative to the active's published data-submission deadline.
| Filing window | Treatment |
|---|---|
| Two years or more before the deadline | Normal review; continues alongside the re-evaluation if not concluded by the deadline |
| Between two years and one year before | Reviewed together with the re-evaluation, or normally where the review needs under a year |
| Within one year of the deadline | Reviewed in parallel with the re-evaluation |
| After the deadline | Review deferred until the re-evaluation concludes, unless its data already covers the application |
The deferred track is the one to avoid. With concluded re-evaluations running at close to four years, an extension filed a month after the deadline can wait most of a product cycle. Filed two years before it, the same extension is a nine-month review. The deadline is published and the filing date is yours to choose, so the track is a scheduling decision.
What a re-evaluation package involves
The re-evaluation application is assessed against current data requirements, not the requirements in force when the product was first registered. For an older active that can mean studies that did not exist at original registration, updated guideline versions, and a fresh set of Japanese-language summaries for the Food Safety Commission. Where an extension is planned in the same period, the data packages overlap substantially, and companies that plan them separately generate work twice. Aligning the two is the single largest saving available in this part of the process.
The obligations in between
Between re-evaluations a registration carries routine duties: annual reporting of production and import volumes and safety information under Article 18 of the Act, change registrations for new crops or pests under Article 7 (nine-month published period), and administrative notifications for changes to the registration certificate, which are same-day and free. Foreign manufacturers registered in their own name under Article 34 also maintain the domestic administrator and its ledger. Registrations lapse when these are neglected, and the published data shows foreign-held registrations being allowed to lapse where the cost of the next data package outweighed the Japanese revenue. That is a commercial decision, but it should be a decision, taken with the deadline in view, rather than a default.
How we support it
We log the deadline for every active in your portfolio, plan extensions around it so they land on the normal track, prepare and file the re-evaluation package with the Japanese summaries, handle the questions from each of the four bodies, and keep the annual reporting and certificate notifications current. Where a re-evaluation outcome threatens a use pattern that matters commercially, our public affairs practice can engage while the assessment is open. See Japan pesticide registration support.
Frequently asked questions
- What is pesticide re-evaluation in Japan?
- A periodic safety review of every registered pesticide against current scientific knowledge, introduced by the 2018 amendment to the Agricultural Chemicals Regulation Act and in force from 1 December 2018. Pesticides registered after that date are re-evaluated roughly every fifteen years. Pesticides already registered are re-evaluated in priority order from fiscal 2021, starting with those most used in Japan and with the greatest potential effect on health and the environment.
- How long does a pesticide re-evaluation take in Japan?
- The published standard processing period is twelve months. Every re-evaluation completed to date has taken between 3.5 and 4.0 years from the data-submission deadline to the issue of the new registration certificate, averaging 3.8 years across the seven concluded as of August 2026. The gap reflects that re-evaluation runs across MAFF, the Food Safety Commission, the Consumer Affairs Agency, and the Ministry of the Environment.
- When is my active ingredient due for re-evaluation?
- MAFF publishes the actives and their data-submission deadlines by fiscal year, currently through fiscal 2028, on its re-evaluation page. Deadlines fall at quarter-ends. For example, cadusafos was due 30 June 2026, quizalofop-ethyl 30 September 2026, alanycarb 28 December 2026, and ioxynil 31 March 2027. If you hold a registration, the deadline for its active applies to you.
- Can I file an extension while my active is under re-evaluation?
- Yes, and the treatment is defined by MAFF Notice 4177. Filing two or more years before the data-submission deadline gets a normal review. Between one and two years before, or within a year, the application is reviewed in parallel with the re-evaluation. Filing after the deadline defers review until the re-evaluation concludes, unless the re-evaluation data already covers the application. Since concluded re-evaluations are running at close to four years, a deferred review is a long wait.