Includes Norway maple aphid (Periphyllus lyropictus)
Pest description and crop damage These aphids are black, soft-body insects on leaves; sticky secretions on leaves and under trees.
Chemical Control of Nursery Pests
It is important to cover foliage thoroughly, including lower leaf surfaces. Apply oils during delayed-dormant period.
For more information
PNW Nursery IPM: Periphyllus aphid on maple (http://oregonstate.edu/dept/nurspest/Periphyllus_aphid.htm)