Hmmmm, im guessing it has to do with fertilization for me then because I have tomato plants growing right next to them and so far they are perfectly healthy. Its only the pepper plants that are affected so I am going to trying flushing it out rather than buying the spray for mites. I should have used osmocote too! I used them last year and my plants grew great. This year I tried tomatotone and MG, which I guess was too much for them.
That's funny you say that about the tomatoes. I have two tomatoes next to my peppers and using the same ferts. They look better than any tomatoes I've ever grown.