솔수염하늘소 성충의 쏠기행동 및 온도에 따른 섭식면적 분석

Abstract

The Japanese pine sawyer, Monochamus alternatus Hope, is a representative vector of the pine wood nematode, Bursaphelenchus xylophilus, which causes wilting symptoms in pine trees. A control method using a net has been introduced, which is an alternative method to the fumigation for the control of dead pine trees by pine wilt disease. This study was carried out to investigate the factors that induce gnawing and escaping behaviors of M. alternatus. The behaviors were examined after M. alternatus adult was placed in a confined space at different temperatures. M. alternatus adults could escape through mesh net torn by gnawing when they were confined in a space of 30 mm or less in diameter. The success rate of escape was high at 20 to 30 ℃, and no adults escaped at 15 ℃. The enticement of M. alternatus adults by food didn't affect the success rate of escape. In the case of not being confined in a narrow space, the escaping hole could not be formed because the gnawing was not concentrated on one part. M. alternatus moved its body in a narrow space using the tarsus of middle and hind legs, and made an escape hole by concentrically gnawing the obstacle on the front side with mandible, and showed a behavior of getting out while supporting the body by supporting the front legs. The present results will be able to use as an important basic information for evaluating the performance of mesh net which confines M. alternatus adults and suggested by alternative method to fumigation technology. In addition, we investigated the feeding rate and average life span at different temperatures to determine the most active period of M. alternatus. They had the longest life span at 15 ℃, but the total feeding area during the life span was not large. The relationship between the life span and daily average feeding area was inversely correlated in the range of 20 to 35 ℃, resulting in a longer life span with daily lower feeding area at 20 ℃ and a shorter life span with daily higher feeding area at 35 ℃. Therefore, the results of this study will be useful to facilitate management options by environmental temperatures.