Departamento de Biología Animal, Vegetal y Ecología, Facultad de Biociencias, Universitat Autònoma de Barcelona, Bellaterra, 08193 Barcelona, Spain.
J Invertebr Pathol. 2013 Mar;112(3):203-7. doi: 10.1016/j.jip.2012.11.012. Epub 2012 Dec 5.
Entomopathogenic nematodes have a broad range of insect hosts, but efficacy varies depending on many factors including insect species and life stage of the host. In this study we examined the susceptibility of males and females of two insect species, the American cockroach Periplaneta americana and the flatheaded rootborer Capnodis tenebrionis to Steinernema carpocapsae by exposing adults to different concentrations. A separate study examined the routes of entry used by nematodes into males and females. Males of both species were more susceptible than females, with greater than 97% infection when a concentration of 50 IJs/cm(2) was applied, whereas mortalities lower than 58% were achieved against females 14 days post-infection. Infective juveniles were detected in similar number on the surface of both sexes, but when compared among internal regions the number of nematodes was significantly higher in gonads and ducts of males than of females for P. americana (5.49 in males; 0.02 in females) and C. tenebrionis (6.88 in males; 0.00 in females).
昆虫病原线虫有广泛的昆虫宿主，但功效因许多因素而异，包括昆虫种类和宿主的生命阶段。在这项研究中，我们通过暴露成虫于不同浓度，检查了两种昆虫，美洲大蠊和扁头沟叩头虫的雄性和雌性对斯氏线虫的敏感性。一项单独的研究检查了线虫进入雄性和雌性的进入途径。两种物种的雄性比雌性更敏感，当应用浓度为 50 IJs/cm(2)时，感染率超过 97%，而感染后 14 天对雌性的死亡率低于 58%。在两性表面都检测到相似数量的感染性幼虫，但当比较内部区域时，在美洲大蠊（雄性 5.49；雌性 0.02）和扁头沟叩头虫（雄性 6.88；雌性 0.00）的雄性性腺和导管中的线虫数量明显高于雌性。
