Aphids on spruce - Knowledgebase Question

Neenah, Wi
Question by sharon2gregg
April 14, 2010
We have brown balls or galls on our spruce trees.We were told it is aphids. Do we treat it systmeically or what would be the best action? It is spreading to another tree closeby. It is thick and I think it might be too late for dormant oil. Please help...Thank you, Sharon

Answer from NGA
April 14, 2010


Cooley spruce galls are commonly found on the new growth of spruce trees. These galls are produced by Insects called Cooley spruce gall adelgids (woolly aphids). Galls appear early in the season as 2- to 4-inch cucumber-shaped growths. The galls are light green during late spring and early summer but dry out and become brown starting in mid-July. The galls often are mistaken for seed cones.

Cooley spruce galls are conspicuous and frequently cause considerable concern. However, the galls usually do not cause any serious harm to the tree. If you choose to use a systemic, use Orthene, Merit or Marathon according to label directions.

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