Managing Borers in Crabapple Trees and Aphids on White Pines

Crabapple Borers

The entry hole with sawdust‑like frass indicates a borer. Duct tape and Vaseline are unlikely to suffocate the larva. Spray the trunk with a borer‑specific insecticide (available at garden centers) so the chemical penetrates the wood and kills the insect inside.

White Pine Aphids and Sooty Mold

The black coating on needles and trunks is sooty mold growing on aphid honeydew. Control aphids with a systemic insecticide applied to foliage and trunk; the mold will disappear once the aphids are gone.