First, thanks one and all for mentioning, even pushing,
The Tarantula Keeper's Guide. It makes Marguerite and me both very proud that you think so highly of it.
And, we have published a webpage on mites and how to deal with them at
MIghty Mites
.
You need to know that there are a truly huge number of different kinds of mites on Planet Earth, and the discussion often devolves into trying to determine whether yours are harmful or not. This sort of thing is way outside the expertise of all but a few hundred or so experts in the field. So, our philosophy is that ALL MITES ARE HARMFUL and should be dealt with the same way: Kill them. Disinfect the cages. Change your arachnoculture habits to reduce the threat.
However, we are not experts on growing either crickets or roaches. The best we can say is that mites have proven to be a real problem with cricket ranches, and we've seen quite a number of postings where people have found them with their roaches as well.
Face it. They're a fact of life, and there's no way to rid yourself of them permanently. With your cricket colony, try to find out how to raise crickets in such a way as to reduce the mite population to a minimum. Your roach colonies as well.
Commercial cricket ranches use the method of setting up new breeding pens/cages with each generation of crickets. Once the crickets have been sold or destroyed (too may are always produced in an effort to meet unpredictable demands), used cages are thoroughly cleaned and disinfected before they are reused. Often, they are moved outdoors where they are exposed to sunlight and the elements for several days to several weeks as an additional way of disinfecting them.
To paraphrase someone in
Alice in Wonderland, "You need to run as fast as you can to stay even with everybody else."
Hope this helps. Best of luck.