Pine Aphid

You will find dark or black aphids clustering on the new needles and shoots of pine trees from spring through summer. Feeding causes needle yellowing and curling. Honeydew accumulation encourages black sooty mold on foliage and underlying surfaces. Heavy infestations stunt growth, particularly on young trees. Pine aphids are common on conifer plantings throughout Western Washington.

Hose infested shoots with strong water spray to reduce colonies. Avoid excess nitrogen fertilizer that promotes lush growth attractive to aphids. Do not spray during flowering periods when beneficial insects visit. Encourage natural enemies including ladybugs and parasitic wasps.