Abstract
AbstractThe leaf galler Diplolepis polita (Ashmead), known only from Rosa acicularis Lindl. west of the Rocky Mountains, is recorded for the first time on the introduced, urban shrub rose Rosa rugosa Thunb. Inquilines and parasitoids commonly kill over 90% of the inducers in populations of galls found in natural habitats, whereas 55% of the galls from the urban roses contained an inducer. Differences in component communities associated with galls on domestic and wild roses are likely indicative of a recently established population in an atypical habitat. Occurrence of D. polita on this new host also provides insight into the host specificity and vagility of cynipid wasps.
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