I don't know the exact life cycle of the mites you have.
But not treating or waiting too long or too short of time to retreat is probably just as bad as not treating.
So make sure you retreat soon and AGAIN in ten more days.
You are going to need to do this for a few (think FOUR) times, IMO, to...
You should probably treat every 10 days for a month.
You have never gotten rid of the mites in the past.
This is how you will get rid of them, by re treating.
"Pyrethrins and pyrethroids. Pyrethrins are a group of insecticides derived from the pyrethrum flower (Chrysanthemum cinerariaefo- lium); synthetic forms based on the naturally occurring com- pounds are called pyrethroids (Blagburn & Lindsay, 2001). Pyrethrins and pyrethroids are among the least...