Thanks for the reply. One more question. Once I dust the cavity and cork the whole, is there any way to know for sure that all of the eggs, etc. have died off ??? I was wondering what would happen if they are not killed off? Will they just continue to bore? But then again, how could they without food ?? So many questions .... :)
We would not be able to know for sure. The bees will be contact with the dust, so eventually should die off. Thank you.