Immigration of rice planthoppers into Fuyang, Zhejiang Province in China during the Baiu season in 1996.

SOGAWA Kazushige, TAKAHASHI Akihiko, TANG Jian, ZHU Min, HU Guowen, KIYOTA Hirotsugu

doi:10.4241/kyubyochu.43.77

Windborn migration of rice planthoppers and associated meteorological conditions were examined at Fuyang (120°E, 30°N), Zhejiang Province, China, and at Kumamoto (131°E, 33°N), Japan, in the Baiu season, 1996. Seven immigration surges of plan-thoppers were recorded at Fuyang in the Baiu season. Massive immigrations of Sogatella furcifera mixed with a small number of Nilaparvata lugens occurred 3 times from late June to early July. In the same period, overseas immigrations of S. furcifera took place at Kumamoto. The planthoppers immigrated to Fuyang when the Baiu front shifted to 30-35°N latitude and depressions emerged on it. Simultaneous immigrations of planthoppers to Kumamoto were associated with the progression of frontal depress-ions from Central China to Japan. Back-trajectories of upper winds at 850 hPa, which started from Fuyang and Kumamoto in the massive immigration period, reached South China in 24-36 hrs and 36-48 hrs, respectively. The trajectory analysis re-vealed a prevalence of southwesterly winds enabling the displacement of planthoppers from South to Central China and Japan in the warm sector of frontal depressions. The Baiu front and frontal depression could be useful synoptic weather conditions for monitoring the windborn migration of planthoppers in monsoonal East Asia.

Immigration of rice planthoppers into Fuyang, Zhejiang Province in China during the Baiu season in 1996.

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