Pheromone traps for pantry moths
An excellent early-warning instrument that a great many people mistake for a cure.
What it is
A sticky card baited with a species-specific sex pheromone, hung in the pantry or feed room. It catches male Indianmeal moths and tells you a population exists, long before you find webbing in a jar.
The numbers
- It catches males only — which is why it monitors rather than controls.
- A rising count is the signal to go find the source bag, which in nearly every case is one reservoir: the forgotten birdseed, the decorative gourds, pasta from two years ago.
- Write the date on the card. The count only means something as a rate.
Why it's here
Early warning is worth real money here, because an infestation found at the trap stage costs you one bag and an hour, and the same infestation found at the webbing stage costs you a shelf.
The automation angle
Honestly, none — this is a card you look at. What *is* worth automating is the storeroom temperature, since the insects' whole development rate is a function of it.
The catch
It will not clear an infestation, and it may even draw moths toward a clean area by broadcasting a lure. Treat it strictly as a gauge. The actual control is the three-part job: freeze what comes in, store in rigid sealed containers, and find and throw out the source bag. A trap that's filling while you do nothing else is just a count of your losses.