My alder trees get these guys every year. I tried to wrap fly paper around the trunks this year and it appears to have helped a bit, but do they fly up from the ground into the upper areas of the trees or do they migrate up the trunks into the leaves? If they travel up the trunk, sticky tape would seem to be a possibility for controlling them. Any ideas? I lost an ancient singleton alder years ago from these bugs. If left alone, they can do significant damage.
My alder trees get these guys every year. I tried to wrap fly paper around the trunks this year and it appears to have helped a bit, but do they fly up from the ground into the upper areas of the trees or do they migrate up the trunks into the leaves? If they travel up the trunk, sticky tape would seem to be a possibility for controlling them. Any ideas? I lost an ancient singleton alder years ago from these bugs. If left alone, they can do significant damage.