I don't know about that dust--down here Howard Garrett recommends diatomatious earth for lots of things. Do you think it would work for you in this application? Visit http://www.dirtdoctor.com and do a search on the many uses.
I worked one summer at San Juan Island National Historic Park in Washington State's Puget Sound, and out there we had lots of owls who took care of the voles. As a park ranger, I used to take visitors through a wooded area where the owls used to perch. You could literally pick up a dried felt-like owl pellet under the trees and talk to the visitors about the wildife, then pick this apart to show the entire skeleton (dismantled) of the vole, packed in it's own undigestible fur.
Our tomatoes here have been ripening for weeks, and we're not fending off predators and trying to keep the fungus (turns the leaves yellow) at bay. I have some "super fantastic" (maybe "super terrific") type tomatoes, not the largest around, but nice and it resists some of the hot weather. I also have a hedge of cherry tomatoes. The skins are tough, but blanched and peeled they are soooooo good in anything you want good tomato flavor in.