Warsi Sanower, Mbata George N
Agricultural Research Station, Fort Valley State University, Fort Valley, GA.
Environ Entomol. 2018 Oct 3;47(5):1226-1232. doi: 10.1093/ee/nvy099.
Host mortality and progeny production by the ectoparasitoid, Habrobracon hebetor Say (Hymenoptera: Braconidae) on diapausing and nondiapausing larvae of Plodia interpunctella Hübner (Lepidoptera: Pyralidae) were investigated in response to peanut depths and free space at standard environmental conditions. The free space was created by having four different quantities of peanuts in glass containers of fixed volume or same quantity of peanut in containers of different sizes. Host mortality caused by the parasitoids was significantly higher for diapausing larvae compared with nondiapausing larvae at corresponding peanut depth. Differences in peanut depth affected mortality of nondiapausing larvae exposed to parasitoids but diapausing larvae experienced the same level of mortality. Regardless of container sizes, host mortality was higher than 90.0% for both types of larvae. When equivalent peanut depths were compared, more F1 parasitoids were produced on diapausing larvae than on nondiapausing larvae. Reduced peanut depth affected the sex ratio of parasitoid progeny reared on nondiapausing larvae but not those reared on diapausing larvae. Parasitoid progeny resulting from reduced peanut depth was male-biased and this was more evident with parasitoids that emerged from diapausing host larvae than nondiapausing larvae. Progeny production by H. hebetor was not influenced by container size. This study underscores the fact that host mortality caused by H. hebetor at different peanut depths was significantly different for nondiapausing host larvae, but was not so for diapausing larvae. The container sizes did not affect the performance of H. hebetor in killing P. interpunctella. The entire study emphasizes the potential of diapausing larvae for the rearing of H. hebetor.
在标准环境条件下，针对花生深度和自由空间，研究了外寄生蜂哈氏啮小蜂（Habrobracon hebetor Say，膜翅目：茧蜂科）对印度谷螟（Plodia interpunctella Hübner，鳞翅目：螟蛾科）滞育和非滞育幼虫的寄主死亡率及子代产量。自由空间通过在固定体积的玻璃容器中放置四种不同数量的花生，或在不同尺寸的容器中放置相同数量的花生来创造。在相应的花生深度下，与非滞育幼虫相比，寄生蜂导致的滞育幼虫寄主死亡率显著更高。花生深度的差异影响了暴露于寄生蜂的非滞育幼虫的死亡率，但滞育幼虫的死亡率水平相同。无论容器大小如何，两种类型幼虫的寄主死亡率均高于90.0%。当比较同等花生深度时，滞育幼虫上产生的F1寄生蜂比非滞育幼虫上的更多。花生深度降低影响了在非滞育幼虫上饲养的寄生蜂子代的性别比例，但对在滞育幼虫上饲养的寄生蜂子代没有影响。花生深度降低产生的寄生蜂子代偏向雄性，这在从滞育寄主幼虫羽化的寄生蜂中比从非滞育幼虫羽化的寄生蜂中更明显。哈氏啮小蜂的子代产量不受容器大小的影响。本研究强调了这样一个事实，即不同花生深度下哈氏啮小蜂导致的非滞育寄主幼虫的寄主死亡率存在显著差异，但滞育幼虫并非如此。容器大小不影响哈氏啮小蜂杀死印度谷螟的效果。整个研究强调了滞育幼虫用于饲养哈氏啮小蜂的潜力。
