The bean bug, Riptortus pedestris, is one of major hemipteran pests against the soybean, Glycine max in Korea. In previous study, it was suggested that water-taking in the first instar nymphal stage of R. pedestris is certainly necessary for successful ecdysis and their survival. To investigate water-taking behavior of the first instar nymphs of R. pedestris on plant, electrical penetration graphic patterns were analysed while R. pedestris fed on the napa cabbage leaf, Brassica rapa subsp. pekinensis by using EPG system. In the result, a X-waveform was dominantly observed for average 42.0 min out of total recording time (120 min). There was significant positive correlation (r = 0.457, P = 0.000452, n = 55) between body weight increase and cumulative durations of X-waveform. In addition, histological observation of cross-sections indicated that stylet tip in the plant tissue during X-waveform period is located nearby xylem cells, suggesting that X-waveform is closely related to xylem sap feeding behavior of R. pedestris in plant.

우리나라에서 수액으로 채취하는 수종인 대나무, 참다래 나무, 고로쇠나무의 수액을 이용하여 메주에 천일염과 죽염을 섞어 재래식 제조방법으로 3개월 발효 숙성시킨 후 간장의 품질특성을 비교 분석하였다. pH는 천일염으로 제조한 참다래수액 간장이 높았으며, 색도는 일반물로 제조한 간장보다 수액으로 제조한 간장의 색도(명도)가 높았고, 식염과 아미노태질소 함량은 참다래수액 간장이 높게 나타났다. 수액종류에 따른 간장의 유기산 조성은 malic acid가