Can someone tell me what has caused this. I found mites (just a few, not a major infestation)which I have sprayed with neem oil but I think this may be caused by something else. It starts on the fan leaves,takes over the plant and kills it and it started on one plant and slowly spread to all of them, the pots are large, have used this size before and never had any hassles and its outdoors. Can someone ID this before its too late and recomend what to do. Thanx dd