Rescued this Aralia three years ago. Was infected when i got it with the same bug. Four months of Neem oil spray seemed to have cleaned it up. Now it is back and is living in my heated garage, alone with grow lights. I think I need an insecticide but do not know what kind of bug it is to buy the correct product. Also how can I judge its age? Photos of leaves attached. Mike

White fly

All I know about its age is that it's more than 3 years old.