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Gall formations can be found on a number of different trees and shrubs, however oak trees tend to be the most common host. Gall formations are most often caused by a parasitic infection. These abnormal formations may develop on leaves, twigs, or bark. Tree health is not affected by most gall activity and applications are not recommended.

The pictures below show nipple gall on a Pin Oak:

Oak Gall Oak Gall

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