Damaged leaves

by Fabrizio
(Miranda)

Recently I noticed my trident maple started getting just a little of black spots on the leaves. So I sprayed it with water with the hose pipe because I thought it could be a aphid problem. The problem stopped for just a few days then some spots appeared, so I used a soup insecticide recipe. The next day there were more black spots on the leaves and the black spots spread throughout the plant. I don't know what is causing this. I sometimes spray water on the leaves when I water it 1 every 3-4 days. And know I have a problem that is getting worse every day. I stopped spraying water on the leaves and this hasn't help! I need help!