Resumo. Coleoptera é a ordem mais numerosa e diversificada de Insecta. Possuem diversos tipos de alimentação, sendo que os besouros herbívoros atacam cultivos agrícolas e plantas ornamentais causando prejuízos aos agricultores. Conhecer as espécies que afetam o cultivo local é uma forma de diminuir seu impacto e propor formas de manejo corretas. Os objetivos deste trabalho foram identificar os coleópteros coletados em armadilhas contendo o óleo de citronela ou seus componentes (citronelal, citronelol e geraniol) instaladas em Ponta Grossa, Paraná e, caracterizar a coleopterofauna através de diferentes análises ecológicas. Somente os coleópteros foram identificados e contabilizados. O programa ANAFAU analisou: índices de frequência, abundância, dominância e constância. Pelo PAST avaliou-se a diversidade, equitatividade e similaridade da comunidade atraída pelas armadilhas. Foram coletados 1269 coleópteros, distribuídos em 23 famílias. Diabrotica speciosa (Germar)foi a única espécie superdominante, superabundante, superfrequente e constante ao longo de toda a amostragem, correspondendo a 54,68% das coletas. Citronela 1% (25,22%), citronelol 1% (25,06%) representaram 50,28% das capturas. Citronela 1% teve a maior diversidade e riqueza de espécies e citronelol 0,5% a menor. O citronelal 1% e o citronelol 1% apresentaram maior similaridade entre as espécies capturadas nestas duas armadilhas. É possível inferir que a distribuição dos coleópteros capturados nos compostos ocorreu devido à presença de moléculas do atrativo também estarem presentes em seus feromônios. O elevado número de D. speciosa coletadas confirma o potencial atrativo dos compostos testados que podem vir a auxiliar na redução de pragas agrícolas, diminuindo o uso de agrotóxicos.Coleopterofauna (Insecta: Coleoptera) collected in traps with essential oil of citronella or its components in the city of Ponta Grossa, Paraná, BrazilAbstract. Coleoptera is the most numerous and diverse order of Insecta. They have various feeding behaviors, being that herbivorous beetles attack agricultural crops and ornamental plants, causing losses to farmers. Knowing the species that affect the local culture is a way to reduce its impact and to propose correct ways of handling them. The objectives of this research were to identify Coleoptera collected in traps containing citronella oil or its components (citronellal, citronellol and geraniol) installed in Ponta Grossa, Paraná, and to characterize the coleopterofauna through different ecological analysis. Only beetles were identified and counted. The ANAFAU program analyzed: indices of frequency, abundance, dominance and constancy. For PAST, the diversity, equity and similarity of the community attracted by the traps was evaluated. A total of 1269 beetles were collected, distributed in 23 families. Diabrotica speciosa (Germar) was the only superdominant, superabundant, superfrequent and constant species throughout the whole sampling, corresponding to 54.68% of the captures. Citronella 1% (25.22%) and citronellol 1% (25.06%) represented 50.28% of the catches. Citronella 1% had the highest diversity and species richness and citronellol 0.5% the lowest. Citronellal 1% and citronellol 1% showed greater similarity between the species captured in these two traps. It is possible that the distribution of the Coleoptera captured in the compounds occurred due to the presence of attractive molecules also being present in their pheromones. The high number of D. speciosa collected confirms the attractive potential of the tested compounds that may help to reduce agricultural pests, reducing the use of agrochemicals.
The third instar larva and pupa of Macraspis morio Burmeister, 1844 (Rutelinae: Rutelini: Anticheirina), collected in Paraná, Brazil, is described and illustrations and comments are given. The larva differs from other Macraspis larvae by the head with 6 posterofrontal setae and mandibles with a blunt second left incisor tooth. The pupa is similar to that of M. festiva Burmeister, 1844.
Resumo. Uma análise sobre a flutuação populacional da entomofauna associada a culturas de interesse econômico pode fornecer subsídios para o manejo integrado de pragas. Dentre os grupos economicamente relevantes podemos citar os coccinelídeos, conhecidos por serem predadores naturais de pragas agrícolas como afídeos. O presente trabalho se faz necessário visto que os Campos Gerais ainda carecem de dados sobre Coccinellidae relacionados a pomares de árvores frutíferas. O estudo foi realizado no pomar do Colégio Agrícola Estadual Augusto Ribas (Ponta Grossa-PR) de julho de 2004 a junho de 2006. As coletas foram feitas usando cada espécie do pomar, sendo elas agrupadas em dois grupos: cítricas e decíduas. Harmonia axyridis (Pallas) foi a espécie mais representativa na amostragem, compreendendo 38,35 % das coletas. as árvores cítricas apresentaram o maior número de insetos totalizando 82,19% da amostragem. É pertinente sugerir que a presença da H. axyridis pode ter afetado a diversidade da comunidade local, sendo ela uma espécie invasora e considerada uma melhor competidora. As árvores cítricas se apresentaram como as mais diversas. Podemos atribuir essa distribuição a maior presença de afídeos nas árvores cítricas, que foram atraídos pelos óleos voláteis secretados por essas plantas. No período final da amostragem houve uma queda populacional, que pode ser atribuída a condições climáticas desfavoráveis, e consequente redução a abundância dos afídeos presa e dos próprios coccinelídeos. Uma maior quantidade de recursos de presa permitiria que mais espécies de joaninhas coexistissem sem competir fortemente. Uma pesquisa futura poderia comparar situação da comunidade, analisando a influência da H. axyridis nas espécies locais.Diversity and seasonality of coccinellids (Coleoptera: Coccinellidae) in an orchard in the city of Ponta Grossa, ParanáAbstract. An analysis of the population fluctuation of entomofauna associated with crops of economic interest can provide subsidies for integrated pest management. Among the economically relevant groups we can mention the Coccinellidae, known to include natural predators of agricultural pests such as aphids. The present work is necessary since Parana's Campos Gerais still lack data on Coccinellidae related to orchards of fruit trees. The study was conducted in the orchard of Augusto Ribas State Agricultural College (Ponta Grossa-PR) from July 2004 to June 2006. Samples were collected from each species of the orchard, grouped into two groups: citrus and deciduous. Harmonia axyridis (Pallas) was the most representative species in the sample, comprising 38.35% of the collections. Citrus trees had the highest number of insects totaling 82.19% of the sample. It is pertinent to suggest that the presence of H. axyridis may have affected the diversity of the local community, being an invasive species and considered a better competitor. The citrus trees presented themselves as the most diverse. We can attribute this contribution to the greater presence of aphids in the citrus trees, which were attracted by the volatile oils secreted by these plants. In the final period of sampling there was a decrease in population size, which can be attributed to unfavorable climatic conditions, and consequent reduction in the abundance of prey aphids and of the coccinellids themselves. A greater amount of prey resources would allow more species of ladybugs to coexist without competing strongly. A future research could compare community situation by analyzing the influence of H. axyridis on local species.
An updated morphological description for Omophoita elytralis (Bechyné, 1956), stat. nov., is presented, including the first account of the genitalia for this species. The separation Omophoita elytralis from O. octoguttata (Fabricius, 1775) is supported by differences found in the median lobe of males, elytral tegument uniform in color (not patterned), and their allopatric geographical distribution.
Given that many descriptions of Coleoptera were made with only external and superficial characters, an update to the original characterization of species is deemed necessary. This study focuses on updating the know morphological data for the adults of Omophoita octoguttata (Fabricius,1775) (Galerucinae, Alticini), a flea beetle native of southern Brazil. We also give insights on the morphology of its immature stages. The adult can be easily recognized by the pale macula at vertex, six large pale maculae, and two smaller in the humeral region at the elytra. The immatures are similar to other know Oedionychina. Eggs oval and orange. Mature larvae present setae bearing scoli, a reddened body, pygopod present, and lacking stemmata, but with curved hook-like tarsal claws. The pupae present slender black setae through its yellowed body, with the elytral and hind wing thecae curved around the body. The eggs are laid in small clutches in the soil and when the larvae eclode they stay in the aerial parts of plants. The mature larvae form a cocoon of soil matter around themselves for their pupal phase. Morphological remarks for larva and pupa of this species when compared to other members of the genus remain limited, demanding further studies with other species.
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