Manuscrito recibido el 27 de julio de 2015 y aceptado para su publicación el 13 de noviembre de 2015. RESUMENEn el centro de la Provincia de Buenos Aires, durante la campaña agrícola 2014/2015 se registraron dos larvas endofíticas barrenadoras del tallo en rama negra. Para su identificación y estudio, ejemplares recolectados en las malezas fueron llevados al laboratorio para su disección. Las larvas encontradas correspondieron a dos insectos del Orden Coleóptera de las familias Curculionidae y Mordellidae. El barrenador Curculionidae pertenece al género Lixus y el de la familia Mordellidae es del género Mordellistena. Los adultos fueron obtenidos sobre las plantas trasplantadas y en los muestreos a campo sobre ejemplares de rama negra y en algunos casos refugiados dentro de las galerías. Si bien estos organismos pueden comportarse como enemigos naturales de rama negra, hay antecedentes de larvas de insectos barrenadores que interfieren con las prácticas de control químico, por limitar el transporte de herbicidas sistémicos. Palabras claves: Conyza spp.; Coleoptera; Larvas barrenadoras; Insectos endofíticos. Lixus and Mordellistena stem borer larvae in Hairy Fleabane (Conyza bonaeriensis L.) plants ABSTRACT Lixus and Mordellistena stem borer larvae in Hairy Fleabane (Conyza bonaeriensis L.) plantsIn the center of Buenos Aires Province, during the crop year 2014/2015 two endophytic stem borer larvae were found in Hairy Fleabane plants. In order to study and identify the species, samples of this weed were collected and taken to the laboratory for dissection. The larvae corresponded to two insects of the Coleoptera order, Curculionidae and Mordellidae families. The Curculionidae borer belongs to the genus Lixus and the Mordellidae borer was identified as Mordellistena genus. Adults Revista FAVE -Ciencias Agrarias 14 (2) 2015 Comunicación 2 | Revista FAVE -Ciencias Agrarias 14 (2) 2015 V. F. Juan et al.individuals were obtained from Hairy Fleabane in pots, and from field sampling plants, in some cases within the galleries. Even if these individuals can act as natural enemies of Hairy Fleabane, it must be pointed out that some background information mentions larvae of stem-boring insects, that may cause a negative effect on chemical control practices, as they limit the transport of systemic herbicides.
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