My young dwarf orange tree is being attacked by ants. Im not sure it is because of aphids. I have not been able to find any. I think they are creating holes in the leaves. And i know for sure that they like the blossoms. They destroyed one blossom and now they are trying to get into a closed blossom. They've mannaged to make a hole at the tip of the blossom.

What should i do? Pesticieds? If so any ones that you would recommend