Whiteflies, Gnats, Black Gnats, Spider Mites? Most likely spider Mites and those things are bastards!! I have have tried everything and these things are hard to kill! Just go buy some Fruit&Vegetable Made from (Safe Home&Garden) spray from Home depot, wet the leaves liberally on both sides and in a weeks do it again, until you have killed both the Eggs and Spider mite adults. The Spray doesn't kill the eggs, re-spray is a must in a day or 2 after the prior spray. This spray can also be used up until the day of harvest as well. Be sure to do boths sides of the leaves or else you can kill the ones on top, but still leaving the assholes underneath.