Adult Morphological Measurements: An Indicator to Identify Sexes of Japanese Pine

솔수염하늘소(Monochamus alternatus) 성충의 형태 측정과 암수 구분

  • Published : 2004.03.01

Abstract

Numerical measurements were made for fresh weight, body length and width, head width, and color and length of antenna of Japanese pine sawyer, Monochamus alternatus adults, a primary vector of pine wood nematode, Bursaphelenchus xylophilus in Korea. We measured 563 females and 601 males that emerged out of dead pine logs from 2001 to 2002. General linear model analysis showed that measurements of fresh weight, body length, and body width were significantly higher in females than in males. Head width was not significantly different between sexes. Antennal length of males was significantly longer than that of females. For females and males respectively, average fresh weights were 0.305g and 0.277g, body lengths 20.97mm and 19.93mm, body widths 6.52mm and 6.18mm, head widths 3.78mm and 3.70mm, and antennal lengths 31.19mm and 45.49 mm. Antennal length or ratio of antennal length to body length overlapped in some ranges between 2 sexes. Therefore antennal length itself or ratio of antennal length to body length could not be used as a definite criterion to discriminate sexes. However, check on color of the antennae of 4,033 adults revealed without exception that basal part of every segment of flagellum of female antenna was covered with whitish-grey hairs, while whole part of every segment of male flagellum was covered with brownish-black hairs. This characteristics might be a best way to differentiate sex of this species.

2001년부터 2002년까지 소나무재선충의 매개체인 솔수염하늘소 성충의 생체중과 체장, 체폭, 두폭, 더듬이의 길이 및 색깔 등을 조사하였다. 소나무재선충에 감염되어 고사된 소나무를 일정한 길이로 잘라 우화망실 안에 두고 우화하는 솔수염하늘소 성충을 채집하여 조사하였다. 분산분석결과 생체중, 체장, 체폭의 측정치는 암컷이 수컷보다 높았고, 두폭은 암수간에 차이가 없었으며, 촉각의 길이는 수컷이 더 길었다. 암컷(n=563)과 수컷(n=601)의 평균 생체중은 각각 0.305g과 0.277g, 체장은 20.97mm와 19.93mm 체폭은 6.52mm 와 6.18mm, 두폭은 3.78 mm와 3.70mm, 촉각의 길이는 31.19mm와 45.49mm이었다. 촉각의 길이나 체장과 촉각 길이의 비율은 암수간에 중복되는 범위가 많아서 이것을 기준으로 암수를 구분할 수는 없었다. 그러나 성충(n=4,033) 촉각의 털 색깔을 조사한 결과, 예외 없이 암컷 촉각의 모든 편절 마디의 기부쪽 절반 정도가 회백색의 미모로 덮여 있으나, 수컷 촉각의 편절 마디는 전체적으로 흑갈색의 미모로 덮여 있었기 때문에, 이 특징으로 암수를 쉽게 구분할 수 있었다.

Keywords

References

  1. Arihara, T. 1982. Weight of the pine sawyer and its longevity. Transactions of the 34th Meeting of the Tohoku Branch of the Japanese Forestry Society, pp.134-135
  2. Choi, K.S., Y.J. Chung, S.C. Shin and J.D. Park. 2003. The distribution and infestation of the pinewood nematode, Bursaphelenchus xylophilus, in Korea. Korea-Japan Joint Conference on Applied Entomology and Zoology, Busan, Korea. pp.36-37
  3. Chung, Y.J. 2002. Occurrence and spread of pine wilt disease in Korea. Tree Protection 7: 1-7
  4. Enda, N. 1973. Relationship between feeding amounts and weight change of pine sawyer. Transactions of the 84th Meeting of the Japanese Forestry Society. pp.321-322
  5. Enda, N. 1997. The damage of pine wilt disease and control in Asia. Forest Pests 46: 182-188
  6. Hokuryukan, 1965. Iconographia insectorum Japonicirum colore naturali edita. Vol. 2. Hokuryukan Co. Ltd. Tokyo, Japan. 301pp
  7. Hosoda, R. 1974. Relationship between the size of pine sawyer adult and the number of pine wood nematodes in its host. Transactions of the 25th Meeting of the Kansai Branch of the Japanese Forestry Society, pp.306-309
  8. Igarashi, M. 1985. Ecological characteristics of the pine sawyer in Tohoku District. Annual Report of Tohoku Branch Station of Forest Experiment Station 26: 103-112
  9. Kishi, Y. 1995. The pine wood nematode and the Japanese pine sawyer. Thomas Company Limited, Tokyo, Japan. 302 pp
  10. Korea Forest Service. 2003. Guideline for the control of forest diseases and insect pests. Korea Forest Service, Daejeon, Korea. 198pp
  11. Makihara, H. 1988. Kinds and life history of vector insects; History of and current research on pinewood nematode. pp.44-64. national association for forest pests control. Tokyo, Japan
  12. Mamiya, Y. 1988. History of pine wilt disease in Japan. Journal of Nematology, 20: 219-226
  13. Ochi, K. and K. Katagiri. 1974. Ecological studies on the Japanese pine sawyer, Monochamus alternatus Hope (Coleoptera: Cerambycidae) (II); Size and shape of field population adults. Journal of Japanese Forestry Society, 56: 399-403
  14. Okuda, M. 1971. Continuous rearing of the pine sawyer under constant temperatures. Transactions of the 22th Meeting of the Kansai Branch of the Japanese Forestry Society, pp. 133-134
  15. Yi, C.K., B.H. Byun, J.D. Park, S.I. Yang and K.H. Chang. 1989. First finding of the pine wood nematode, Bursaphelenchus xylophilus (Steiner et Buhrer) Nickle and its insect vector in Korea. Research Reports of Forestry Research Institute 38: 141-149