Took some grain weevils, froze for 24 hours, and proved to myself that they don't survive below freezing. I know, maybe a duh, but I wanted to know with some certainty. No idea if eggs survive the freeze.
Here's a before (bugs crawling all over the jar) and after (sleepy time for bugs). I watched the "after" jar for a full day; they have definitely moved on to the big grain bin in the sky. Click on pics if you need to see a closeup of dead bugs.
Before...
After...
Here's a before (bugs crawling all over the jar) and after (sleepy time for bugs). I watched the "after" jar for a full day; they have definitely moved on to the big grain bin in the sky. Click on pics if you need to see a closeup of dead bugs.
Before...
After...