Pollution-detector
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Hemadas nubilipennis
Blueberry Stem Gall Wasp
Hemadas nubilipennis is a tiny chalcid wasp in the family Ormyridae that induces distinctive kidney-shaped (reniform), multichambered stem galls on lowbush blueberry (Vaccinium angustifolium). The female oviposits into shoot tissue 5–15 mm below the apex, then destroys the shoot tip by stinging it with her ovipositor. This structural damage terminates shoot growth and redirects nutrients to gall tissue and larval development—a rare example of parental investment through deliberate host tissue damage. The wasp has been studied for its economic impact on blueberry production and, more recently, for the galls' ability to accumulate environmental contaminants, making them useful as pollution detectors.