In apple orchards, the damages by woodborers are increased. Mainly infesting woodborers are elucidated three species, namely, the fruit-tree pinhole borer (Xyleborinus saxeseni (Ratzeburg)), black timber bark beetle (Xylosandrus germanus (Blandford)), and Xyleborus apicalis (Blandford). Investigated result from population densities of woodborers using trap at Apple Research Station in Gunwi, Gyeongbuk, X. saxeseni and X. germanus were first captured from late-March and reached highest peak at mid-April. X. apicalis also first captured from late-March and reached highest peak at mid/late-May than April. Entrance hall was first observed from late-March and recorded highest number at April, but steadily decreased. Numbers of entrance hall according to the apple varieties were ordered as ‘Hwangok’ > ‘Fuji’ > ‘Hongro’. Entrance hall by tree height were mainly observed range from 21 to 80 cm (from the ground), found with highest entrance hall at 190 cm. Entrance hall by lateral branch order were mainly occurred at the first lateral branch from the ground, but the entrance hall was decreased as height increased. The ratio of trunk and branch were showed as 6.5 : 3.5.

• Sun-Young Lee(Apple Research Station, National Institute of Herbal and Horticultural Science, Gunwi 716-812, South Korea)
• Changmann Yoon(Apple Research Station, National Institute of Herbal and Horticultural Science, Gunwi 716-812, South Korea)
• Yun-Su Do(Apple Research Station, National Institute of Herbal and Horticultural Science, Gunwi 716-812, South Korea)
• Jung-Sub Lee(Apple Research Station, National Institute of Herbal and Horticultural Science, Gunwi 716-812, South Korea)
• Kyung-Hee Choi(Apple Research Station, National Institute of Herbal and Horticultural Science, Gunwi 716-812, South Korea)