Can you suffocate fleas

I don't suggest you do this, because it is harming life, and you wouldn't like it if it was done to you.

Anyway, you probably can if you keep it in a dome, although this may be death from starvation or dehydration, not necessarily suffocation.

to answer above^:Then please come on down and take all of our fleas no really take them all then.

Harming life? FLEAS harm life (disease carriers) Im using a mixture of food grade diatomaceous earth, salt, boric acid, and sulfur