Okutani-Akamatsu Yasuyo, Watanabe Tomonari, Azuma Masaaki
Tottori Agricultural Experiment Station, Tottori, 680-1142, Japan.
J Econ Entomol. 2007 Aug;100(4):1276-81. doi: 10.1603/0022-0493(2007)100[1276:mabsrh]2.0.co;2.
Stenotus rubrovittatus (Matsumura) (Heteroptera: Miridae) causes brown or black marks on rice, Oryza sativa L., grains (pecky rice), and it is becoming of increasing importance in Japan. Attractiveness of adult females or males of S. rubrovittatus to conspecific individuals was examined in the field in 2003 and 2004. Unmated female-baited traps captured significantly more males than did the unmated male-baited traps. However, the numbers of females captured by female- or male-baited traps were low, and they were not significantly different from the numbers caught by the control traps. No nymphs were captured by any traps. In 2004, we examined the effects of age and mating experience on female attraction ability with the goal of understanding the role of reproductive development in the observed behavior. The daily number of males captured by young unmated female (3-d-old)-baited traps increased from the first day until the fourth day of experiments, and then capture started to decrease. The peak in the number of captured males corresponded to the preoviposition period. When we observed ovarian development of S. rubrovittatus females under 25 degrees C and a photoperiod of 16:8 (L:D) h, we found that vitellogenesis had already started in approximately 30-50% of 1-d-old individuals. By the fifth day after emergence, 50-70% of individuals had mature eggs. These results indicated that the attractiveness of females is the strongest when egg laying becomes possible. Therefore, S. rubrovittatus females attract males selectively for mating, and it is probable that females use a sex pheromone for the attraction.
红纹狭盲蝽（松村，半翅目：盲蝽科）会在水稻（Oryza sativa L.）谷粒上造成褐色或黑色斑点（霉稻米），在日本，其危害正日益严重。2003年和2004年在田间对红纹狭盲蝽成年雌虫或雄虫对同种个体的吸引力进行了研究。未交配雌虫诱捕器捕获的雄虫显著多于未交配雄虫诱捕器。然而，雌虫或雄虫诱捕器捕获的雌虫数量较少，且与对照诱捕器捕获的数量无显著差异。所有诱捕器均未捕获若虫。2004年，为了解生殖发育在观察到的行为中的作用，我们研究了年龄和交配经历对雌虫吸引能力的影响。在实验的第一天到第四天，由年轻未交配雌虫（3日龄）诱捕器捕获的雄虫数量逐日增加，之后开始减少。捕获雄虫数量的峰值与产卵前期相对应。当我们在25℃、光照周期为16∶8（L∶D）h的条件下观察红纹狭盲蝽雌虫的卵巢发育时，发现约30 - 50%的1日龄个体已经开始卵黄发生。到羽化后第五天，50 - 70%的个体有成熟卵。这些结果表明，当雌虫能够产卵时，其吸引力最强。因此，红纹狭盲蝽雌虫会选择性地吸引雄虫进行交配，雌虫很可能利用性信息素进行吸引。
