Laboratory and field studies to evaluate the potential of an open rearing system of Lysiphlebus testaceipes for the control of Aphis craccivora in Argentina

摘要: The aim of this work was to examine, both in the field and laboratory, ecological aspects selected plant–aphid–parasitoid interactions evaluate their potential for open rearing parasitoid Lysiphlebus testaceipes (Cresson) (Hymenoptera: Aphidiinae) control Aphis craccivora (Koch) (Hemiptera: Aphididae) alfalfa agroecosystems. To end quantitative samplings parasitoids aphids were made fortnightly three crop fields spontaneously vegetated edges, Rafaela (Santa Fe, Argentina), during years (2009–2011). Three sink webs based on L.testaceipes, a per-year basis, constructed assess strength established by parasitoids, host ranges alternative aphid species, tendencies use across years. In emergence rates, parasitism larval pupal development times, adult lifespan L. analyzed means choice tests, including target species assays. About 84 % adults obtained samples came from nerii (Boyer de Fonscolombe), an innocuous only associated with plants genus Araujia Brotero (Apocynaceae). Based our results, system proposed has many features that support its feasibility be used as testaceipes: unrisky aphid, easy reproduction banker plant similar suitability pest oviposit complete without noticeably preference specific hosts.