Occurrence of Obolodiplosis robiniae (Diptera: Cecidomyiidae) in Japan and South Korea

A gall midge species forming leaf margin roll galls on Robinia pseudoacacia L. (Fabaceae) was newly found in Japan and South Korea. Based on morphological features, this gall midge was identified as Obolodiplosis robiniae (Haldemann), which is native to eastern North America. There was no sequential variation among five individuals from Japan and South Korea. Since R. pseudoacacia is an alien plant, this gall midge is likely to have entered Japan and South Korea from North America.