Kyeong-Yong Lee

Comparison of the Colony Development of the Bumblebees, Bombus terrestris Produced from Domestic and Foreign Bumblebees Companies

We compared colony development and survival rate after artificial hibernation between the bumblebees, Bombus terrestris, produced from domestic and foreign companies. The number of worker and queen produced from foundation colony of three domestic and one foreign companies was 232.4-270.8 and 62.0-181.8, respectively, but there was no statistical difference. In colony development of B. terrestris queens which were terminated diapause by narcosis at different companies, oviposition rate, colony foundation and progeny-queen production of bumblebees produced from domestic companies were superior to those from foreign company. But foreign company in the number of worker and queen was superior to domestic companies. On the other hand, survival rate and colony development of B. terrestris queens, which were terminated diapause by artificial hibernation at three domestic and two foreign companies, were no significant differences. These results indicate that oviposition, colony foundation, progeny-queen production, and survival rate after artificial hibernation showed no differences between the bumblebees produced from domestic and foreign companies.

Distribution Status of Mason Bees, Osmia spp.(Hymenotpera: Megachilidae) in Apple Orchard of Korea

We investigated the distribution, sex ratio, natural enemies, and nesting competition insects of mason bees, Osmia spp. in 32 apple orchards during 2006 to 2008. The rate of bee nested was 14.0±1.7%, and Yeongju and Chungju were the highest rate of nested among 10 locations, which were 2 times higher than average rate of nested. The rate of fauna nested were 66.0% for Osmia spp., 21.7% for natural enemies and 11.6% for nesting competition insects. We collected five species of Osmia spp. consisting of Osmia cornifrons, O. pedicornis, O. taurus, O. satoi and O. jacoti. In case of collected five Osmia spp, O. cornifrons was 69.6%, which was the dominant species and O. pedicornis was 13.0% and O. taurus was 11.2%, respectively. The collecting rate of Osmia spp. was significant difference among each year and 10 locations. The sex ratio of Osmia spp. were 1:1.9 in O. cornifrons, 1:5.1 in O. pedicornis and 1:2.2 in O. taurus. The sex ratio of O. cornifrons was significant difference among each year and 10 locations. Seven species of natural enemies that attack Osmia spp. were collected in apple orchard. Trogoderma and Chaetodactylus showed the highest rates with 48% and 38% among 7 natural enemies. Also, we collected nine species of nesting competition insects. Anterhynchium flavomaginatum showed the highest rates with 38.6% among 9 nesting competition insects.