Seasonal occurrence of Riptortus pedestris on hairy vetch and difference of its development and longevity according to host plants

The seasonal occurrence of Riptortus pedestris was investigated using pheromone traps baited with its aggregation pheromone in various crop compositions including hairy vetch for 3 years from 2010 to 2012. The incoming of R. pedestris into the experimental fields began to catch in traps from late-April. After seed gathering season in mid-July, the incoming rate of R. pedestris decreased, and their activities were continually observed till early-December. Otherwise, during the three years of the investigation, 43 species of Hemiptera including R. pedestris collected, which indicated abundant species diversity in hairy vetch fields. There were captured in the order Dolycoris baccarum, Apolygus watajii, Adelphocoris suturalis for 3 years. However, in the laboratory, R. pedestris could not developed successfully to adult stage as a host plant with only seed and plant of hairy vetch, with decreasing survival rate 4^th instar and the failure of emergence to adult stage. Consequently, hairy vetch may be not a suitable host for the development and survival of R. pedestris. It may be considered that R. pedestris is a temporary visitor at the season of hairy vetch seed formation in fields.