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Cooley Spruce Galls

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A-Star Arborist

A-Star Arborist

Date Joined:
Jun 17, 2010

Posts:
166

Posted: Wed Mar 23, 2011 07:57 PM

Subject: Cooley Spruce Galls

These Galls are common and are sometimes rarely noticed when quickly glancing at the tree. They are very visiable when an inspection is taken place if present. The galls are created by an aphid insect. This problem takes place over time and requires two different types of trees to produce. The two trees needed for the galls are spruce trees and Douglas Firs.


The galls start off light green on the tips of new growth which is easy for the insect to get inside. This is not noticeable. Once the bug is in the tree tips generally by the fall, dries out and looks like a spruce cone. This is how people dont think anything of it.


Once the bug is on the Douglas Fir, many eggs are laid on the needles. The insect nibbles on the needles and causes minor needle damage, and nothing to worry about. The insects devolop and gain wings, where they then fly back to the spruce to overwinter.


There is no reason to worry or even remove the odd growths. The bug has allready left. This will eventually fall off and new growth branches will blend into its spot. If there is a major infestation it generally means that the two host trees are very close to each other. There are sprays to control this however rarely takes place. Horticulture Oil, Soaps, and other chemicals can be used by a Certified Pesticide Installer.

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