Technical note
Changing pheromone supplier mid-season without changing the catch
Changing supplier in the middle of a season is a risk that is usually taken for commercial reasons and paid for in field data. It can be done without losing a season, but only if the comparison is set up before the material is ordered.
Start with documents, not with samples
The first comparison is two certificates: the incumbent’s last lot and the candidate’s offer. Compare the isomeric ratio, the method and the assay basis. If the candidate cannot produce a batch certificate, the evaluation is over — a product data sheet is a description, not a measurement.
Match in the right order
- Isomeric form and ratio. Non-negotiable for the component that carries the load.
- Identity and assay basis. Same compound, same method, comparable numbers.
- Impurity profile. Usually less critical, but a different route brings different trace impurities, and one of them may matter to your carrier.
- Packing. Change it last. A new supplier and a new unit size at the same time gives you two variables and one season.
Trial on the smallest blend that is still representative
A bench blend confirms that the material weighs and mixes as expected. It does not confirm field performance. What it does do is catch the failures that are cheap to catch: a lot that will not dissolve in your carrier, a packing that does not fit your dispenser line, a certificate that does not match the drum.
Do not change two things at once
The most common mistake is qualifying a new supplier while also reformulating, or while also changing dispenser. When the result is worse, nothing can be attributed. Hold the blend and the dispenser constant for one full evaluation cycle; the season after, change the next variable.
Keep the paperwork
Retain the trial certificate, the blend batch record and the field result together. Two years later, that trio is the only thing that will explain why a blend that used to work stopped working — and it is also what makes a second-source qualification auditable rather than anecdotal.
The trial to scale page covers the same sequence from the supplier side; the quality page describes what travels with each lot.
Need the specification behind this?
Send a CAS number and the quantity, and the answer comes back in writing with the isomeric form and packing attached.