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Kayo SHIRAI
Department of Agroenvironmental Science, Obihiro University of Agriculture and Veterinary Medicine
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Harukuni HORITA
Hokkaido Prefectural Plant Protection Office
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Fumio TANAKA
Hokkaido Prefectural Tokachi Agricultural Experiment Station
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Akio TANII
Hokkaido Prefectural Donan Agricultural Experiment Station
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Yosuke MINO
Department of Agroenvironmental Science, Obihiro University of Agriculture and Veterinary Medicine