Hmm, not sure what ur brown bugs are. As for mites, if not mistaken, they do damage to the leaves of your plants. They usually cause your leaves to be very crinkled, scrunched up, and wilted. My eggplant on my farm were infested with mites. I used Kelthane with a couple of drops of dishsoap as a spreader-sticker, pruned all the nercotic leaves, and all is well with my eggplant.