I have a bo tree (ficus religiosa) that I received as a tiny seedling in the spring. It grew great outside all summer and more than doubled in size. About 6 weeks ago I brought it inside and put it in front of a south facing window. In the past week it has dropped 4 of it's leaves. Today I noticed brown spots on the leaves, and several cob-web like things. I sprayed it with a 50/50 water/rubbing alcohol spray to get the cob-webs off. My plan is to continue to spray the leaves. My question is, should I remove the leaves with brown spots? Would it be okay to remove all of the leaves and cut the trunk back some? Would it grow back? Any other suggestions?
Here's a picture of the tree:
Here's the brown spots on one of the leaves: