-The main bee species visiting Piper hispidinervum (C.DC.) inflorescences, their abundance and relative frequency were recorded. Visiting schedule and the influence of climatic factors on the abundance variation of those species were also verified. Insects were collected from P. hispidinervum inflorescences of an 0.5 ha experimental area at Embrapa Acre, using a mouth aspirator, from July/99 to June/2000. Bees visited P. hispidinervum inflorescences during the whole year. An amount of 2,555 individuals, belonging to 20 bee species, were collected. Augochlorini sp. (taxon near to Pereirapis), Pereirapis sp., Scaptotrigona sp.1, Dialictus sp., Scaptotrigona tricolorata Camargo and Augochloropsis sp. were considered dominant. Augochlorini sp. e Pereirapis sp. were more abundant in the dry months, Scaptotrigona species in the rainy months, while Dialictus and Augochloropsis species did not show a defined occurrence season. The subfamily Meliponinae prevailed in number of species, while the family Halictidae prevailed in number of individuals. In general, the significant correlations between climatic variables and abundances of dominant species were low or medium. There was a strong preference of the bees for visiting long pepper inflorescences between 8 am and 9 am, which can be related to the availability of resources and the increase of temperature during the day.
Resumo-A madeira de mogno, Swietenia macrophylla King, é valorizada no mercado internacional por sua beleza e durabilidade para fins nobres, como mobiliários e decoração. Quaisquer tentativas de plantios comerciais dessa espécie de modo a reduzir a pressão exercida pela sua exploração seletiva invariavelmente fracassam devido à incidência da broca do ponteiro do mogno, Hypsipyla grandella (Zeller). Embora alguns trabalhos tenham obtido relativo sucesso em apresentar técnicas de controle sob aspectos pontuais, ainda não foi estabelecida uma estratégia de manejo integrado que seja prática, econômica e eficiente para H. grandella no Brasil. Este trabalho tem como objetivo rever e atualizar informações sobre o inseto e seu hospedeiro, além de indicar as áreas de pesquisa mais promissoras para o seu controle em plantios de S. macrophylla no País. As estratégias de controle de H. grandella mais recomendadas são o uso da resistência da planta, manejo silvicultural, uso de semioquímicos e controle biológico, nas quais há necessidade de incentivos a pesquisas de longo prazo. Ensaios de resistência natural de procedências de S. macrophylla devem ser incentivados, devido às extensas áreas com reservas naturais no Brasil. Termos para indexação: Broca do ponteiro do mogno, broca das Meliaceae, Cedrela odorata, manejo integrado de pragas.
Several studies have characterized and delimited subterranean ant assemblages. Soil extraction, one of the methods employed to access this fauna, employs the removal of monoliths. One of the most widely used methods for the extraction of soil sampling is called TSBF (developed by the Tropical Soil Biology and Fertility Programme). This method provides relevant data about the species associated with the soil. In the present study we characterized assemblages of subterranean ants using the TSBF method in different subtropical areas of the Neotropics. We considered two sampling designs in different localities. The first design resulted in 315 TSBF samples obtained from layers at distinct depths. The second design resulted in 270 TSBF samples and 270 epigaeic pitfall trap samples. This material was used to delimit the species that occur exclusively in the subterranean stratum (TSBF) and that are not found on the soil surface. A total of 281 species were recorded. Of these, 57 can be considered subterranean, based on their occurrence in subterranean strata. We also verified that the highest occurrence of ants was in the first 10 cm of soil depth. Due to the importance of using methods that efficiently extract the subterranean ant fauna in studies, we suggest the TSBF method should be used to sample ants or to associate this method with epigaeic pitfall traps to delimit strictly subterranean assemblages in specific community stratification studies.
RESUMO -A soja é uma cultura em expansão na região Norte e, no Estado do Acre está em fase de adaptação, o que pode levar ao surgimento de insetos e o comprometimento da produção dessa oleaginosa. Por isto, estudou-se a incidência de pragas e de seus inimigos naturais em onze cultivares de soja, em faixas de 40 χ 8m (320m 2 ), em uma área de 3520m 2 . Em cada faixa monitorada, delimitou-se uma área de 80m 2 , onde não houve controle de pragas. Semanalmente, foram realizadas, em cada cultivar, duas amostragens na área pulverizada com inseticidas e duas em área não pulverizada, utilizando-se o método do pano de batida. Além disso, foram coletados ovos de percevejos-praga para determinação do nível de parasitoidismo dos mesmos. O causou maior desfolha nas áreas não pulverizadas, enquanto Lebia concinna Germar (Coleoptera: Carabidae), Callida sp. ABSTRACT -The soybean crop is increasing in the northern region of Brazil and it is in Carabidae), Callida sp. (Coleoptera: Carabidae) and Tropiconabis sp. (Hemiptera: Nabidae). Main seed sucking bugs were Piezodorus guildinii Westwood (Hemiptera: Pentatomidae) and Euschistus heros Fabr. (Hemiptera: Pentatomidae), with parasitoidism of 39.9 and 53.3% of eggs of those bugs, respectively. Telenomus podisi Ashmead (Hymenoptera: Scelionidae) was the most
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