Tree bug Infestitation - Knowledgebase Question

Wellington, Fl
Question by mdnavy
March 29, 2009
On my oak trees, there are round growths about the size of a fingernail or larger that have a small hole in each to allow bug access. Inside the round hole grows a bug that when the round growth busts open, the bug exits. I have not seen the bug when it exits the growth. There are approximately 50 such growths ranging from .5

Answer from NGA
March 29, 2009


What you describe are called oak tree galls and are made by a wasp. Generally, insecticidal control is not satisfactory because the wasps are physically protected within the galls. As a rule, the galls are unsightly but will not harm your tree. Where practical, pruning of infested twigs may help to reduce the problem on lightly-infested trees. However, pruning is impractical if large trees are heavily infested. A commercial arborist may be able to provide assistance with valuable plantings.

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