As soon as we open a new bag of flour, we put it away in various tight containers that we keep for the purpose.
I only ever ate an insect willingly once.
And that, folks, is the classic definition of a threadkiller. 
Don’t take it personally – we’re not talking because our mouths are full.
Ok it has been 8 days - stuff goes out of the freezer and the next lot goes in - sigh. I have traps, have sprayed out cupboards with surface spray, next i will wipe out the cupboards with eucalyptus. I hope to hell this all works.
At least it’s not gagh.
Complete cleaning, then containers with a good seal (we sandwich ours with cling wrap, which sometimes makes the difference).