It is most likely the yellow-bellied sapsucker Sphyrapicus varius.

Apr 12, There could be several reasons for leaf drop, but the most likely cause may be the leaf stalk trees dropping green leaves in fall or petiole borer. Both insects burrow into the leaf petiole in the spring, causing the leaves Author: Tom Bruton. Sep 10, If you have a tree that is losing leaves – and the lost leaves have spots on them – that is a sign that you have a problem with tree health.

The two most likely culprits are that you either have tree pests or a tree disease, such as a fungal infection. To determine the cause of your poor tree health, you’ll need to inspect the affected bushmulching.barted Reading Time: 6 mins. Sep 25, Thanks for the question. If the oak branches that are falling have green leaves on them, you are most likely seeing the result of squirrel nest building activity. Normally this is more common in early summer and/or early winter. That it might be occurring now is a bit unexpected.

May 31, A close examination of leaves on the ground will likely show leaves with only a small portion of their stems (petiole). This leaf drop is caused by the feeding of maple petiole borers, Caulocampus acericaulis. Petiole borers are small insects called sawflies, which are non-stinging bushmulching.barted Reading Time: 2 mins.