Herbicides are registered with CIB&RC under the Insecticides Act, 1968. Beyond the standard chemistry and toxicology package, a herbicide file turns on bio-efficacy against the specific weed flora claimed, crop safety and phytotoxicity data, and, for persistent actives, residue and succeeding-crop studies. A herbicides registration consultant plans and files this package.
What makes a herbicide file distinct
Insecticide efficacy is measured against a pest; herbicide efficacy is measured against a weed flora that varies by region, season and cropping system, while simultaneously proving the crop itself is unharmed. That double burden — weed control and crop safety — is where herbicide dossiers succeed or fail.
Three issues recur. First, trials conducted against a weed spectrum that does not match the label claim, so the claim has to be narrowed at the last stage. Second, phytotoxicity data generated at label dose only, when the Committee expects observations at higher doses to establish a safety margin. Third, no data on succeeding crops for actives with soil persistence, which invites a query that costs a full season to answer.
Herbicides we handle
Non-selective actives including glyphosate and its salts, glufosinate ammonium and paraquat dichloride; selective post-emergence chemistry such as fenoxaprop-p-ethyl, clodinafop-propargyl, bispyribac sodium, imazethapyr, metsulfuron methyl, chlorimuron ethyl, sulfosulfuron, quizalofop-ethyl and pyrazosulfuron ethyl; and pre-emergence actives such as pendimethalin, butachlor, pretilachlor, atrazine, metribuzin, oxyfluorfen and alachlor. We also file the ready-mix combinations that now dominate the market, where the interaction between the two actives has to be justified as well as each active's performance.
Scope of work
- Route selection and a written data gap analysis for the specific crop-weed claims you want
- Design and placement of bio-efficacy trials across the agro-climatic zones relevant to the claim
- Phytotoxicity trials at label and multiple-of-label doses, with the observation schedule the guidelines specify
- Residue, persistence and succeeding-crop studies where the active's soil behaviour requires them
- Five-batch analysis, physico-chemical characterisation and specification setting
- Toxicology and ecotoxicology packages, including aquatic organism data for actives used near water bodies
- Draft label with dosage, spray volume, time of application, weed spectrum, waiting period and cautionary statements
- Filing, agenda tracking, query replies and post-registration changes
Adding a claim to an existing herbicide
Much of our herbicide work is not new registration at all — it is extending a registered product to a new crop, a new weed, or a different time of application. This is often the fastest commercial win available to a formulator, because the chemistry and toxicology are already on record and the incremental requirement is bio-efficacy and crop safety for the new claim. We assess whether a claim extension is realistic before you commit to trials, and we are candid when it is not.