Hello Mark.....

I checked with a couple of other folks and we believe these are Dogwood Sawflies.

https://extension.unh.edu/blog/2020/07/what-eating-my-dogwood-leaves

https://bygl.osu.edu/node/1354

Eliminating dogwood sawflies requires a combination of preventive measures, physical removal, and targeted treatments. Dogwood sawflies are pests that can defoliate dogwood trees and shrubs. Here's a step-by-step approach to dealing with them:

1-Pruning: If you notice early signs of sawfly infestation, you can try to physically remove the larvae by pruning affected branches. Dispose of the pruned branches away from the tree to prevent further spread.

2-Manual removal: For small infestations, you can pick the larvae off the leaves by hand and dispose of them in a bucket of soapy water.

3-Natural predators: Encourage natural predators of sawflies, such as birds, ladybugs, and lacewings, to inhabit your garden. These predators can help keep sawfly populations in check.

4-Biological control: Beneficial nematodes are microscopic organisms that can target and control sawfly larvae. You can purchase nematodes at garden centers and apply them following the instructions on the package.

5-Insecticidal soap: Insecticidal soap is a relatively safe option for controlling sawflies. Spray the soap solution directly on the larvae, as it suffocates them. Follow the product instructions carefully.

6-Neem oil: Neem oil is another organic option that works as an insect repellent and disrupts the growth and development of sawflies. Dilute neem oil with water and spray it on the leaves following the product instructions.

7-Chemical insecticides: If the infestation is severe and other methods have not worked, you may consider using chemical insecticides specifically labeled for sawfly control. Always read and follow the instructions and safety guidelines on the product label.

8-Preventive measures: To reduce the likelihood of future sawfly infestations, keep your dogwood trees healthy by providing proper watering, mulching, and fertilization. Healthy trees are more resilient to pests.

9-Monitor regularly: Regularly inspect your dogwood trees for any signs of sawfly larvae or other pests. Early detection allows for more effective control