トゲシラホシカメムシ（カメムシ目：カメムシ科）成虫の飛翔活動の季節変動と水田内への侵入方法

抄録

To clarify the flight activity of Eysarcoris aeneus（Scopoli）, we used a simple method that involved counting the number of adults flying out of a cup. We confirmed that the flight activity was spontaneous. On examining the effects of sex and experimental conditions on the flight activity of adult bugs, no significant difference in the numbers of male and female adults flying out of a cup were noted. The number of adults flying out of a cup under outdoor conditions was significantly greater than that of adults spontaneously flying out of a cup under indoor conditions. Compared with indoor conditions, outdoor conditions triggered a 2.6-fold increase in the flying activity. The individual rate of flying under outdoor conditions ranged between 7% and 73%, and the peaks in the flying activity were observed between mid-May and late May, in late July, and in early September. We also investigated the rice field invasion method of E. aeneus adults using wave-type levee sheets. We found the number of adults invading by walking and flying to be 3.3-fold greater than that of invading by flying alone. Therefore, the invasion method of adult bugs in rice fields is estimated to be primarily via walking.