old oak tree question
i have an oak tree in my yard that is massive. two people have to wrap their arms around it to be able to touch fingers. it has only developed maybe 40-50% of its leaves this year in michigan. we just bought the house and there are some trees growing underneath it, which i plan to remove, as well as a grapevine variety that is attacking the nearby trees. i plan on removing that as well.
i do not notice any sap running or fungus or bugs or anything out of the ordinary around the tree except for other trees.
does anyone know what might be causing the lack of leaves? some branches appear dead but other appear to look semi-normal. also, do tree removal places usually have knowledge about sick trees or do they just remove them?
thank you so much.
i have first time home buyer ignorance,please help!