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In 2003, gall midge larvae of the genus Resseliella (Diptera: Cecidomyiidae) were found infesting the cores of Japanese pear, Pyrus pyrifolia (Rosaceae), in Fukushima Prefecture, Japan. Symptoms of infestation are similar to those noted previously for Japanese pear in Japan and Korea. From 2007 to 2008, gall midge larvae that were similar to those found in Fukushima Prefecture were detected in Tottori and Shimane Prefectures, Japan under the bark of Japanese pear. Based on morphological comparison with known congeners associated particularly with Rosaceae in the Palaearctic region and those occurring in Japan, we concluded that the gall midge infesting Japanese pear is a new species of Resseliella. DNA sequencing data also supported this conclusion. This new species seems to be identical to the ‘pear codlin midge’ reported previously from Japan and Korea. We describe the gall midge as Resseliella yagoi sp. nov. and provide information on host plant cultivars, distribution, behavioral and life history traits, and pest status.

A new species of Resseliella (Diptera: Cecidomyiidae) infesting Japanese pear, Pyrus pyrifolia (Rosaceae)