63 research outputs found

    Incidencia natural de parasitoides em ovos de percevejos (Hemiptera: Pentatomidae) encontrados na soja no Distrito Federal.

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    Um levantamento das especies de parasitoides de ovos de pentatomideos presentes na soja foi realizado em Planaltina, DF. Doze especies de parasitoides de ovos (Telenomus edessae Fabricius, Telenomus podisi Ashmead, Telenomus sp.; Trissolcus basalis (Wollaston), Trissolcus brochymenae Ashmead, Trissolcus sp., Trissolcus teretis Johnson, Trissolcus urichi Crawford; Anastatus auriceps Ashmead, Eupelmus sp., Ooencyrtus sp. e Neorileya sp.) foram encontradas em sete especies de percevejos em soja: Acrosternum aseadum Rolston, Edessa meditabunda (Fabricius), Euschistus heros (Fabricius), Nezara viridula Linnaeus, Piezodorus guildinii (Westwood), Podisus nigrispinus (Dallas) e Thyanta perditor (Fabricius). Registrando-se, pela primeira vez, a ocorrencia de novos hospedeiros de A.auriceps (A.aseadum); T. teretis (E.heros e T.perditor); T.urichi (A.aseadum, P.guildinii e P.nigrispinus)

    Agricultural machinery adequacy for handling the mombaça grass biomass in agroforestry systems.

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    Abstract: The current scenario of Agroforestry Systems (AFS) worldwide lacks specific machinery, resulting in practically all operations being carried out manually. This leads to a significant physical effort for small-scale farmers and limits the implementation of AFS to small areas. The objective of the study was to evaluate the suitability of existing machines for performing agroforestry tasks. This research utilizes Descriptive Statistics and Exponentially Weighted Moving Average methods to evaluate the data and compare the treatments, where different machines are used to cut Mombaça grass (Megathyrsus maximus Jacq): (i) costal brushcutter (CBC); (ii) tractor-mounted rotary brushcutter (RBC); and (iii) mini grain reaper machine (GRM). The experiments were conducted in Jaguariúna, São Paulo, Brazil. GRM is recommended for achieving greater biomass production, reducing raking time, and minimizing operational costs. CBC is suitable for smaller areas due to its affordability and slow operation, which requires significant physical effort. RBC is recommended for reducing working time, physical effort, and personnel costs, making it suitable for larger-scale contexts

    Acute pulmonary histoplasmosis and first isolation of Histoplasma capsulatum from soil of Rio Grande do Sul, Brazil

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    A case of acute pulmonary histoplasmosis, where the clinical histoiy and epidemiological data led to the identification of H. capsulatum natural source, is described. Specimens of spleen and liver, obtained after intraperitonial inoculation in mice, grew H. capsulatum in culture from the soil of rural area of General Câmara, by the first time in Rio Grande do Sul
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