A New Product Label and the Applicator's Existing Equipment
An applicator has been using a particular herbicide for years under an older label. The manufacturer has reformulated the product and the new label carries a different EPA registration number, a revised application rate, a required droplet size range, and a statement that the product must not be applied when a temperature inversion exists. The applicator's sprayer is set up with coarse nozzles that produce droplets outside the new label's required range. The applicator has half a tank of the old formulation left and wants to finish the field with the old product, then switch to the new one without recalibrating.
1. Can the applicator legally finish the field with the old formulation under the old label? What governs?
Read the worked answer
The applicator may generally continue to use product already in possession under the label that was in effect for that product, provided the use is consistent with the label that accompanied that container and the product is not otherwise prohibited. However, the applicator must confirm which label applies to the specific container-the label affixed to or accompanying that product. The key point is that the applicator cannot mix and match: the old product is governed by its own label, and the new product by the new label. The applicator should not assume the old label's rate or restrictions carry over to the new formulation.
2. What must the applicator do before applying the new formulation, and why do the label changes matter beyond the rate?
Read the worked answer
Before applying the new formulation, the applicator must read the new label in full, recalibrate the sprayer to deliver the labeled rate, and change nozzles or operating parameters to produce droplets within the required size range. The applicator must also observe the inversion restriction-meaning applications should be timed when the atmosphere is mixing, not during calm early-morning or evening conditions. The droplet-size and inversion requirements are drift-management conditions on the label; applying outside them is a label violation even if the rate is correct. The applicator's current coarse nozzles do not meet the new label, so using them would be noncompliant. The applicator should also verify the new EPA registration number matches the container and keep the new label on file.
3. How should the applicator handle the transition so that records and equipment stay consistent?
Read the worked answer
The applicator should treat the two products as separate jobs: record the old-formulation application under the old label (product name, EPA reg. number, rate, date, conditions), then clean the tank, change to compliant nozzles, recalibrate, and record the new-formulation application under the new label. Records should reference the correct EPA registration number for each product so an inspector can match the application to the governing label. Mixing equipment setups or records between the two creates ambiguity that is difficult to defend in an audit or complaint investigation.