Small gray bugs on Pine trees

Asked October 15, 2016, 3:42 PM EDT

I noticed many of these tiny gray bugs on the pine needles of a Ponderosa Pine, but also smaller amounts on an Austrian Pine in my yard. I'm trying to determine if they are something to be concerned with, like Pine Scale, or something else. They have almost a spiderlike appearance. I have attached two photos. Any information would be greatly appreciated.

Arapahoe County Colorado integrated pest management trees and shrubs insect issues horticulture

1 Response

These insects are aphids, most likely woolly pine needle aphids (Schizolachnus spp).

They can injure needles with their feeding activity, especially when numerous.

Consider hosing them off the needles by spraying with a strong jet of water from a nozzle. Insecticidal soaps sprayed directly on the aphids should desiccate them.

See also: http://extension.colostate.edu/docs/pubs/insect/05511.pdf

http://extension.colostate.edu/docs/pubs/insect/05547.pdf