Pine sawyer beetle, Monochamus saltuarius preferred the feed on fresh twig of Korean white pine trees (Pinus koraiensis) than one-year old and two-year twig. It means that the current twig is appropriate to increase the lifespan and reproduction of this insect. In a bioassay after fractionated the hexane layer from the water layer, the hexane layer did not show feeding response; however, the water layer was preferred in the order of fresh twig>one-year twig>two-year old twig. By HPLC analysis, we identified three kinds of sugar, namely, fructose, sucrose, glucose. The quantity of fructose was the highest in fresh twig followed by one-year and two-year old twig. In the preference test using each standard sample, the order was fructose>sucrose>glucose at 10, 30 μg/filterpaper, and fructose>sucrose >glucose at 50μg/filterpaper. From the above result, fructose plays an important role as a feeding stimulant for pine sawyer adult.

• Jeong-Oh Yang(Dept of Plant Medicine, Chungbuk National University)
• Hee-Geun Ahn(Dept of Plant Medicine, Chungbuk National University)
• Doo-Jin Noh(Dept of Plant Medicine, Chungbuk National University)
• Changmann Yoon(Dept of Plant Medicine, Chungbuk National University)
• Ju-Hwan Han(Chugbuk Forest Research Institute)
• Gil-Hah Kim(Dept of Plant Medicine, Chungbuk National University)