Meagher Robert L, Nagoshi Rodney N
US Department of Agriculture-Agriculture Research Service Center for Medical, Agricultural and Veterinary Entomology, Gainesville, FL 32608, USA.
Environ Entomol. 2013 Aug;42(4):751-7. doi: 10.1603/EN13007.
Attraction of wild male fall armyworm, Spodoptera frugiperda (J. E. Smith), was compared in trapping experiments during 2005-2009 in Florida. Traps were baited either with a commercial sex pheromone lure or corn and rice strain females obtained from laboratory colonies. Over 6,900 male moths were collected, and a large subset (>1,500) of these moths was analyzed for their host strain identity. The pheromone lure attracted over four times more males than virgin corn or rice strain females. Almost 60% of males attracted to the pheromone lure were identified as corn strain. However, both corn and rice strain females attracted a higher percentage of rice strain males, providing evidence that the commercial lure used in our study is biased to attract corn strain males and underestimates rice strain population numbers relative to corn strain numbers. Corn and rice strain males were attracted more to corn strain females than rice strain females, although there was variation in response according to location and season. Our results suggest that attraction of males to corresponding-strain females does not appear to be a premating mechanism that results in assortative mating between corn and rice host strains. Clearly other premating or perhaps even postmating mechanisms are important for the maintenance of host strains in S. frugiperda.
2005年至2009年期间，在佛罗里达州进行的诱捕实验中，对野生雄性草地贪夜蛾（Spodoptera frugiperda (J. E. Smith)）的诱捕情况进行了比较。诱捕器要么用商业性信息素诱芯，要么用从实验室菌落获得的玉米品系和水稻品系雌蛾进行诱饵。共收集了6900多只雄蛾，并对其中很大一部分（>1500只）雄蛾进行了宿主品系鉴定分析。性信息素诱芯吸引的雄蛾数量是未交配的玉米品系或水稻品系雌蛾的四倍多。几乎60%被性信息素诱芯吸引的雄蛾被鉴定为玉米品系。然而，玉米品系和水稻品系的雌蛾都吸引了更高比例的水稻品系雄蛾，这表明我们研究中使用的商业诱芯在吸引玉米品系雄蛾方面存在偏差，相对于玉米品系数量，低估了水稻品系的种群数量。玉米品系和水稻品系的雄蛾对玉米品系雌蛾的吸引力比对水稻品系雌蛾的吸引力更大，尽管根据地点和季节，反应存在差异。我们的结果表明，雄蛾对相应品系雌蛾的吸引似乎不是一种交配前机制，不会导致玉米品系和水稻品系宿主之间的选型交配。显然，其他交配前甚至交配后机制对于草地贪夜蛾宿主品系的维持很重要。
