Caterpillars on Birch Tree near downtown Toronto

Hello, first thank you very much to the person who answered my question yesterday about a young birch tree with an aphid infestation and now the appearance of tiny caterpillars about 1-2cm long. In the photo I sent yesterday it…

Birch Tree Disease?

See photo – our Birch tree is approx 25 yrs old. We live in Mississauga, likely with clay soil. It faces north so has part sun, part shade. We have a sprinkler system so is likely not dehydrated. The leaves…