Recent distributional records of an alien gall midge, Obolodiplosis robiniae (Diptera: Cecidomyiidae) in Japan, and a brief description of its pupal morphology
2005
Uechi, N.(Okinawa-ken. Agricultural Experiment Station, Naha (Japan)) | Yukawa, J. | Usuba, S.
Obolodiplosis robiniae (Diptera: Cecidomyiidae) induces leaf-margin roll gall on Robinia pseudoacacia (Fabaceae). It is native to the northeastern states of the USA, but has been found recently in Japan, Korea, Italy, and the Czech Republic. In Japan, the gall midge has been collected from nine prefectures since its first discovery in Fukuoka in 2003. We found that the species is multivoltine in Japan, and adults emerge directly from the galls from early summer to autumn. Mature larvae of the final generation of the year seemed to quit the galls to overwinter on the ground. Further ecological and distributional information needs to be accumulated to clarify the pest status of O. robiniae. Because the pupa of O. robiniae was not intensively studied previously, its morphological features are briefly described as follows: pupal skin not pigmented: antennal sheath without apical horn: apical papillae each with 0.1 mm long seta: upper and lower frontal horns absent; a pair of lower facial papillae each with seta; prothoracic horn about 0.5 mm; very short stigmatal tubercles present on second to sixth abdominal segments; six dorsal papillae present on each of second to seventh abdominal segments; two outer papillae with seta; four inner papillae each with two tiny asetose circles.
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