I planted my tomato seed in a new pot with new organic soil. I first noticed the leaves curling under, some curling into deformed pods. I sprayed with an organic insecticide/fungicide which helped. Then I noticed the veins on the leaves started getting brown crusty stuff on them,eventually working to the stems. The crusty stuff can not be rubbed off. I can't find anything online that looks like it. Could you please help me identify what's wrong and what I can do about it?