I am new to gardening and I've been growing various hot and sweet peppers this year, which started as seeds. All seemed to be going pretty well until recently. As if overnight the leaves of my pepper plants all began turning black. It happened quite rapidly. Does anyone know what causes leaves to turn black like this? Some are in worse shape than others, but all have this problem now to some degree. I am growing them in containers and whiskey barrels. I water them deeply only every few days and do not let water touch the leaves. On some plants I have also noticed white powdery spirals on the underside of the leaves which I suspect are evidence of whiteflies. But even the leaves of plants which show no evidence of whitefly activity are all blackening. I have a couple of plants on which every leaf has turned black! So far I have tried using an insecticidal soap I made by diluting Dawn detergent in water, because I read this can help control whitflies, but it doesn't seem to have done any good. I just bought something called "3 in 1 fungicide" today and am going to try it out, though the product says full leaf coverage is necessary for good results, and considering how extensive the problem is, I don't know if I will be successful. Another problem I have is that some kind of green worm seems to be chewing off parts of the leaves of some of my plants, and leaving what look like holepunch marks in them. I found one of these today: it looked like a green worm and was tucked within a spider-webby looking substance on the underside of a plant leaf. I am less concerned about this than the blackening though, because that seems to be doing far more damage to my plants. If anyone else has suffered from these problems and could tell me what works best for control I'd appreciate it.Thanks!