Avid is the only thing that I've found that works consistantly. You've got to treat your indoor space as a "germ Free lab" and everything that comes in must be treated. If you go over to a buddy's house to see his plants, then change your clothes before you go into your space.

I have treated my space with Avid purchased via ebay and found that I have only used 1/10 of the bottle. I think (it was 2 years ago) I paid $65.00 for the container that I have. It was shipped to California from Florida as you cannot purchase it locally...

I have found that as soon as you've seen that you have mites, your production will be off by 30-70% verse a crop with no mites.

It makes no sense to not use this product unless you are working Organically.

I have sprayed my bloom crop up to 3 weeks from harvest, as that's what the manufacturer has stated for leafy crops such as lettuce, and the USDA has accpeted this study, but it's usually a better idea to spray before bloom while they are still in Veg.