I placed it in a nice sunny spot, gave it a little fert. Now it's pushing some new leaves. The problem is the old leaves are much worse. Some yellowing and dropping. Most look like the photo below. Not being a big fan of pesticides, I thought i'd wait for the new leaves and see if the the fig would resolve its problem. Looked at a new leaf today and it too had these brown spots.

Is it a fungus? If so, what should I treat it with? To be honest, I've never treated any of my trees with fungicide before so I'm a little lost.