Introduction: This paper reports, for the first time, the presence of the Eratyrus mucronatus species in the State of Rondonia, Brazil. Methods: These specimens were caught by chance in the forest and later they were collected using luminous traps. Results: After finding these specimens, the number of the Triatominae genera in Rondonia rose to four, while its species rose to seven. Conclusions: Complimentary studies will be conducted in order to allow for clearer understanding the ecology of this arthropod, its possible role in transmitting Chagas' disease and its current geographical distribution.

The high index of natural infection along with the abundance of triatomines points out to the necessity to create an epidemiological surveillance system to monitor vector-borne transmission and deepen the studies on the ecology of such vectors in the Amazon.

The fruit borer Conotrachelus humeropictus is one of the most important pests of the cupuaçu crop, and can promote yield losses of around 50%. The present study involved the selection of Beauveria bassiana isolates on Conotrachelus psidii larvae, which was used as test insect due to its taxonomic closeness to C. humeropictus. In order to assess their interaction using combined application, we studied the ability of the nematode to carry conidia of B. bassiana and Metarhizium anisopliae to soil layers. This study also aimed to establish a biological control method for cupuaçu borer with the use of the fungus B. bassiana at 10 kg/ha and the entomopathogenic nematode Steinernema brazilense at 1, 3, 9, and 27 IJ/cm2, applied as single and combined treatments. In the selection of B. bassiana strains for C. psidii, the IBCB 276 and IBCB 165 isolates were the most promising ones, causing 86 and 84% mortality, respectively. The IBCB 276 strain was applied in the field to control C. humeropictus. In the study of carriage of conidia in soil, the nematode S. brazilense was found to be capable of carrying conidia of B. bassiana to deep 7 to 10 cm soil layers. This was not observed with M. anisopliae, found only in the topsoil. In field trials against C. humeropictus larvae, B. bassiana promoted 15.6% mortality. The nematode promoted 60.0% mortality at the highest concentration used, and their combined use with B. bassiana (10 kg/ha) increased mortality to 65.6%, with an additive interaction observed between the two entomopathogens.

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O presente estudo relata a predação de Mahanarva fimbriolata em cópula por um Reduviidae Montina confusa, em posição de acasalamento. O relato ocorreu no Sistema Agroflorestal (SAF), 10º43’087”S e 62º13’314”W, estabelecido na Estação Experimental da Comissão Executiva do Plano da Lavoura Cacaueira (CEPLAC-ESTEX-OP), em Ouro Preto do Oeste – RO. Um M. fimbriolata foi capturado durante a cópula, provavelmente porque nessa condição o casal ficou menos diligente, o que os tornam mais vulneráveis aos inimigos naturais, porém a fêmea do Reduviidae mostrou-se hábil quanto à busca de alimento, mesmo com o macho permanecendo sobre seu corpo. Acreditase que a fêmea do M. confusa, durante o cortejo ou após fecundada pode investir mais energias na busca de alimentos para atender a demanda biolgica visando assegurar um melhor desempenho reprodutivo, sendo esse o primeiro relato de predação de M. fimbriolata em cópula por um M. confusa em posição de acasalamento.

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