Apologies if this is the wrong place to post this (I am hoping that this topic falls into the "and more" part of the forum). My parents have a maple tree (not sure what type) in their back yard. They live in Mississauga, Ontario. The tree is developing these horrible, oozing black marks on it - they seem to be aligned with a spot where the branches spread out, where my dad had one of the large branches of the tree removed several years ago.
Can anyone please help me identify what is wrong with our tree? Could you please propose a solution? I have attached pictures. Thanks.