I have had Spider Mites every single grow. And every single time I see them I get out my Neem Oil, mix it up and waalaa problem solved. Only had to spray it twice in one grow but once was enough for all the rest. The secret is in the mix. You have to never reuse it. Must make it fresh every time and catch them early.. Yes in flower, yes in veg, no harm done unless you spray with the lights on then you are just a dumb ass and bound to fail anyway... Was that mean, oh my... Well that is my two cents. Wish someone would tell me how much more yield I would get if I got my rez temps down from in the 90s. Water gets warm every light cycle and well I still have great buds just want to make them all they can be and well money always is the issue and a chiller is not cheap but the only item I don't own yet.... Please let me know.....