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Are pitch tubes reliable indicators of a successful pine beetle attack?

April 26, 2017Attack beetle indicators Pine pitch successful tubes

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Are pitch tubes reliable indicators of a successful pine beetle attack?

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Pitch tubes may convey to inexperienced eyes that pine beetle have visited the tree. However one needs to look for other symptoms and signs to determine if the tree was able to fend off an attack. A healthy tree may be able to “spit out” the pine beetles but the pitch tubes will remain.