hello, i am growing about 14 1-1.5 metre tall tomato plants, each in its own large pot. lately i have noticed brown leaves with green edges to the leaves in some of the lower leaves and sporadically on the plants . . . i have looked up photos of early blight and late blight, but am unsure of whether it is either of these or not . . . also noticed a powdery bright orange residue on some of the leaves . . . and a few aphids here and there sucking on the plants (i've got stickies in there to control the population -- seems to be just one or two bugs now and then). most of these plants were in a makeshift greenhouse with a fan circulating the air; they had decent ventilation, but they were a bit crowded (i've now moved several pots of cucumbers and 2 tomatoes onto the porch). also the fan has been intermittently off, so now always the best circulation, but fair most of the time. how can i positively identify if there's a problem? is there anything i can do now to prevent or remove fungal issues? is it really too late to do anything? thanks in advance for your help!!!