No abstract

Este trabalho registra a ocorrência de Aleurothrixus aepim Goeldi em plantas de mandioca na região Oeste do Paraná, Brasil. A espécie foi primeiramente encontrada em fevereiro de 2009, em área experimental da Universidade Estadual do Oeste do Paraná (UNIOESTE), em folhas de mandioca da variedade fécula branca. Os exemplares foram coletados recolhendo-se folhas infestadas com ninfas de mosca-branca, caracterizadas por apresentar corpo recoberto por filamentos cerosos de coloração branca. O material foi preservado em etanol a 70%, em frascos de vidro, e foram enviados para identificação. Novos surtos foram registrados no início de 2010 e 2011 em diferentes propriedades rurais localizadas no município de Marechal Cândido Rondon. Entretanto, a causa precisa da ocorrência de A. aepim nessa região não está totalmente clara. Nas demais regiões produtoras do Estado, esta espécie ainda não foi detectada.

Vatiga manihotae (Drake 1922) (Hemiptera: Tingidae) is an important cassava pest due to the great potential damage and the increasing population in recent years. However, few studies about bioecology and control of the cassava lace bug have been conducted and their results don't provide adequate control strategies. An alternative to maintain the population below economic injury levels is through the adoption of host plant resistance. To improve the understanding about the bioecology and find new sources of resistance in cassava, the biological parameters and demographics of V. manihotae on five cassava genotypes (Santa Helena, MEcu 72, Col 22, Clone 02 and Clone 03) under controlled conditions (25±2°C, 14L/10D) were evaluated. Duration and viability of the stages, the period egg-adult, sex ratio, the pre-oviposition period, fecundity and longevity of male and female was determined, and a fertility life table was prepared. Insects fed on MEcu 72 showed increased nymphal, egg-adult, and pre-oviposition periods and reduced female fecundity and longevity in comparison to the other genotypes. Demographic parameters (Ro, r m , T, DT) showed a significant impact on the growth potential of V. manihotae fed on MEcu 72 indicating that the populations would diminish over time. The combined effect of these parameters indicated that MEcu 72 has resistance on V. manihotae specimens hindering their development.

Resumo. O cultivo da mandioca tem importância socioeconômica e de subsistência na região Norte do Brasil, sendo uma prática adotada principalmente em pequenas propriedades, por comunidades tradicionais, agricultores familiares e indígenas. Foi verificada a presença de colônias de percevejos-de-renda em plantios de mandioca localizados na terra indígena Kaxinawá de Nova Olinda, Feijó, estado do Acre. Os insetos foram capturados diretamente nas plantas, sendo identificadas as espécies Vatiga manihotae (Drake), Vatiga illudens (Drake) e Gargaphia opima Drake. Configuram-se os primeiros registros de V. manihotae, V. illudens e G. opima no estado do Acre, sendo esta última, o primeiro registro para o Brasil.Lace bugs (Hemiptera: Tingidae) associated with cassava cultivation in Nova Olinda’s Kaxinawá indigenous land, in Acre state, with new record for BrazilAbstract. Cassava cultivation has socioeconomic and subsistence importance in the northern region of Brazil, being a practice mainly adopted in small farms, by traditional communities, family farmers and indigenous people. It was verified the presence of colonies of lace bugs in cassava cultivation located in Nova Olinda’s Kaxinawá indigenous land, municipality of Feijó, Acre state, Brazil. The insects were captured directly in the plants, being identified the species Vatiga manihotae (Drake), Vatiga illudens (Drake) and Gargaphia opima Drake. Therefore, the occurrence of V. manihotae, V. illudens and G. opima in Acre state is recorded for the first time. In addition, G. opima is the first record for Brazil.

First record of egg parasitoids of Oebalus poecilus (Dallas, 1851) (Hemiptera: Pentatomidae) in rice in Maranhão, Brazil  This is the first report of the species Trissolcus urichi (Crawford, 1913) and Telenomus podisi Ashmead, 1893 (Hymenoptera: Platygastridae) parasitizing Oebalus poecilus (Dallas, 1851) (Hemiptera: Pentatomidae) eggs in rice in Maranhão, Brazil. These parasitoids were collected in the municipality of Itapecuru Mirim, MA, in an area of 0.2 ha cultivated with rice. The eggs collected exhibited an average parasitism of 11.4%. Twenty egg parasitoids were collected and identified, these being one Tr. urichi and nineteen Te. podisi. The presence of these naturally occurring parasitoids in the field opens perspectives for updating the species of parasitoids that parasitize pentatomid eggs in rice fields in Brazil.