Lachnus salignis and other species
See:
Pest description and crop damage Large gray to gray-black aphids often are in large numbers on twigs, branches, and trunk. Their legs generally are light brown. A prominent black tubercle is in the center of the back with slightly smaller tubercles on either side. Aphids may be a nuisance around homes when they collect on the sides of the house and crawl through window openings.
Management-biological control
See:
Biological Control of Nursery Pests
Management-chemical control
See:
Chemical Control of Nursery Pests
For more information
Johnson, W.T. and H.H. Lyon (1991), Insects That Feed on Trees and Shrubs, 2nd ed., Cornell University Press (p. 310).