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Blueberry stem gall wasp
Rufus Isaacs, MSU Entomology
Stem gall wasps cause kidney-shaped or spherical growths (2 to 4 cm in diameter) on blueberry stems. The adult wasps emerge from galls during or after bloom and lay several eggs in young stems. The galls develop around these stems during the year, turning from green to brown. Pruning the galls out of the fields is the most effective control for this insect.

Old gall showing wasp emergence holes.


A newly formed gall.
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Last Updated - 6/22/07