12 research outputs found

    A new species of Neoseiulus Hughes (Acari: Phytoseiidae) from Sao Paulo State, Brazil

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    International audienceA new species Neoseiulus jeca n. sp. is decribed in this paper based on specimens collected on Cecropia sp. in the Atlantic Forest area of Sao Paulo State, Brazil. Neoseiulus jeca n. sp. is the third species included in the peruanus species group. This species group has been registered only in South America and Africa

    Two new species of Daidalotarsonemus (Acari: Prostigmata: Tarsonemidae) from Brazil

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    International audienceTwo new tarsonemid species, Daidalotarsonemus esalqi sp. n. and Daidalotarsonemus savanicus sp. n., found on both native and crop plants in Brazil are described herein, based on adult females. Biological aspects of these species are briefly discussed. Individuals of Daidalotarsonemus savanicus sp. n. have been misidentified as Daidalotarsonemus tessellatus De Leon in previous reports of this species from Brazil. A key is provided to distinguish females of the Daidalotarsonemus species known to occur in Brazil

    Nota corta. Especies de ácaros fitoseidos (Acari: Phytoseiidae) en manzanos de Río Negro, Argentina

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    The presence of phytoseiid mites was determined in two unsprayed apple orchards at Cinco Saltos and Cipolletti, Río Negro Province, Argentina. Twenty apple trees were chosen in each orchard and a sample of 10 leaves per tree was taken at seven different sampling dates. Neoseiulus californicus (McGregor), Euseius fructicolus (Gonzalez &Schuster) and Paraseiulus talbii Athias-Henriot were found at Cinco Saltos, and Proprioseiopsis messor (Wainstein), N. californicus and Metaseiulus camelliae (Chant & Yoshida-Shaul) at Cipolletti. Of these species, only N. californicus has previously been reported from the Alto Valle del Río Negro region. Proprioseiopsis messor and Paraseiulus talbii are reported for the first time in South America and on the American Continent respectively.Se llevó a cabo un estudio para determinar la presencia de ácaros fitoseidos en dos plantaciones de manzanos no tratadas con plaguicidas, localizadas en Cinco Saltos y Cipolletti, Provincia de Río Negro, Argentina. Se seleccionaron 20 árboles en cada huerto y se tomó una muestra de 10 hojas por árbol en siete diferentes fechas de muestreo. Neoseiulus. californicus (McGregor), Euseius fructicolus (Gonzalez & Schuster) y Paraseiulus talbii Athias-Henriot fueron las especies identificadas en Cinco Saltos. Proprioseiopsis messor (Wainstein), N. californicus y Metaseiulus camelliae (Chant & Yoshida-Shaul) fueron identificadas en Cipolletti. De las especies recolectadas solamente había sido mencionada previamente N. californicus en la región del Alto Valle del Río Negro. P. messor y P. talbii constituyen nuevas citas para América del Sur y el continente americano, respectivamente

    Review about mites (Acari) of rubber trees (Hevea spp., Euphorbiaceae) in Brazil

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    Mites on Annonaceae species in northeast Brazil and in the state of Para

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    International audienceThe family Annonaceae Juss. comprises over 120 genera and 2000 species with origins in the American, Asian and African tropical regions. Many of these species, such as those of the genera Annona, Rollinia, Duguetia, Uvaria and Asimira, are edible. Some pests have been reported in soursop, sugar apple and atemoya, the main annonas grown in Brazil. However, few mites are mentioned as pests of this plant family. This study aimed to identify mite species associated with the Annonaceae in northeastern Brazil and in the state of Para. A survey was conducted, collecting samples of Annona muricata L. (soursop), Annona squamosa L. (sugar apples), Annona cherimola x A. squamosa (atemoya) and Annona coriacea Mart. (araticum) leaves. Annona coriacea is a wild Annonaceae widely distributed in northeastern Brazil. For each sample, a total of 100 leaves were collected from five individuals of the same species at each site. The samples were taken to the laboratory, where they were processed and the mites were mounted and identified. The mite species found belonged to the families Ascidae, Bdellidae, Phytoseiidae, Stigmaeidae, Tarsonemidae, Tetranychidae, Tenuipalpidae and Tydeidae. Phytoseiidae, Tetranychidae and Tydeidae had the highest diversity. Five of the reported species were found on all four of the studied cultures: Amblyseius aerialis (Muma), Tetranychus mexicanus (McGregor), Parapronematus acaciae Baker, Pronematus ubiquitus (McGregor) and Agistemus floridanus Gonzales

    Fitoseídeos (Acari: Phytoseiidae) associados a cafezais e fragmentos florestais vizinhos Phytoseiids (Acari: Phytoseiidae) associated to coffee plantations and adjacent forest fragments

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    Existem poucas informações sobre a fauna de ácaros predadores (Phytoseiidae) em ambientes naturais brasileiros adjacentes a agroecossistemas cafeeiros (Coffea spp.) ou sobre a influência que essa vegetação exerce como reservatório de ácaros predadores. Neste estudo, objetivou-se avaliar a diversidade destes organismos em cafeeiros e fragmentos florestais adjacentes. Coletaram-se amostras das espécies Calyptranthes clusiifolia (Miq.) O. Berg (Myrtaceae), Esenbeckia febrifuga (A. St.-Hil.) A. Juss. ex Mart. (Rutaceae), Metrodorea stipularis Mart. (Rutaceae) e Allophylus semidentatus (Miq.) Radlk. (Sapindaceae), em oito fragmentos florestais, de 5 a 51 ha, e cafezais adjacentes, nos meses de junho (final período chuvoso) e outubro (final período seco) nos anos 2004 e 2005, na região Sul do Estado de Minas Gerais. Ácaros foram extraídos das folhas, utilizando o método de lavagem e, em seguida, montados em lâminas de microscopia em meio de Hoyer, para identificação específica. No total foram identificados 2.348 fitoseídeos, sendo 2.090 nos fragmentos florestais e 258 espécimes nos cafezais adjacentes, pertencentes a 38 espécies. Servindo-se de análise faunística, a espécie Iphiseiodes zuluagai Denmark & Muma, 1972 apresentou os melhores índices no agroecossistema cafeeiro, sendo muito frequente e constante nas épocas estudadas. Nos fragmentos florestais Amblyseius herbicolus Chant, 1959, Iphiseiodes affs. neonobilis Denmark & Muma, 1978, Leonseius regularis DeLeon, 1965 e Euseius alatus DeLeon, 1966 foram dominantes, muito abundantes, muito frequentes e constantes nas épocas estudadas. Podemos concluir que a vegetação nativa abriga ácaros predadores, inimigos naturais de ácaros-praga, que ocorrem na cultura cafeeira, possibilitando o desenvolvimento de programas de manejo ecológico com áreas de vegetação natural e agroecossistemas cafeeiros adjacentes.<br>There is little information about the fauna of predatory mites (Phytoseiidae) in Brazilian natural environments, adjacent to coffee agroecosystems (Coffea spp.), or about the influence exerted by neighbor vegetation as a reservoir of predatory mites. The objective of this study was to evaluate the diversity of these organisms in coffee plantations and adjacent forest fragments. Samples of the species Calyptranthes clusiifolia (Miq.) O. Berg (Myrtaceae), Esenbeckia febrifuga (A. St.-Hil.) A. Juss. ex Mart., Metrodorea stipularis Mart. (Rutaceae) and Allophylus semidentatus (Miq.) Radlk. (Sapindaceae) were collected in eight forest fragments, from 5 to 51ha, adjacent to coffee plantations, in June (end of the rainy season) and October (end of the dry season) in the years of 2004 and 2005, in the Southern region of State of Minas Gerais. Leaf mites were extracted using the wash method, mounted in microscopy slides with Hoyer's medium for identification. A total of 2.348 phytoseiids was collected, being 2.090 in the forest fragments and 258 in adjacent coffee plantations, belonging to 38 species. According to fauna analysis, Iphiseiodes zuluaguai Denmark & Muma, the year of 1972 presented the best indexes in the coffee agroecosystem, being very frequent and constant in those periods. In the forest fragments, Amblyseius herbicolus Chant, 1959, Iphiseiodes affs. neonobilis Denmark & Muma, 1978, Leonseius regularis DeLeon, 1965 and Euseius alatus DeLeon, 1966 were dominant, very abundant, very frequent and constant in those periods. One may conclude that the native vegetation shelters predator mite, natural enemies of mite-pests that still occur in coffee culture, making possible ecological management program development involving areas of natural vegetation and adjacent coffee agroecosystems

    Mites (Arachnida, Acari) on Citrus sinensis L. Osbeck orange trees in the state of Amazonas, Northern Brazil Ácarofauna de Citrus sinensis L. Osbeck no estado do Amazonas, Brasil

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    Despite the importance of citriculture in Brazil, very little is known about mite populations in citrus crops in the Northern Region. In the municipality of Manaus, 12 sprayed sweet orange orchards were surveyed every two weeks during seven months to record mite species amount, and to describe the abundance and distribution of the most important species. The size and age of the orchards varied from 3,360 to 88,080 m² and seven to 25 years, respectively. In the fourteen sampling period, leaves, twigs and fruits were collected from 12 trees, one per orchard. In total, 3,360 leaves, 672 twigs and 1,344 fruits were sampled from 168 trees. Mites were manually extracted from the fruits, and by the washing method on leaves and twigs. We identified pests with the potential to cause economic loss. Fourteen species of phytophagous and mycophagous mites from Eriophyidae, Tarsonemidae, Tenuipalpidae, and Tetranychidae were recorded. Brevipalpus phoenicis (Geijskes 1939) and Phyllocoptruta oleivora (Ashm., 1879), the two commonest phytophagous mites in other Brazilian regions were dominant, showing that local orchards are susceptible to their infestation. Eleven predatory mites were recorded, comprising 10% of the mite population, belonging to Phytoseiidae and Ascidae. Phytoseiidae was the richest family, with ten species. The results are discussed in relation to the temporal variation aspects and habitat use of the most important species. Long-term research encompassing chemical applications followed by evaluations of the mite community are necessary for a better management of the orchards, taking into consideration the seasonal phenology of key pests.<br>Apesar da importância da citricultura no Brasil, pouco se conhece sobre as populações de ácaros em plantações de citros no norte do país. No município de Manaus, 12 pomares de laranja doce pulverizados foram avaliados a cada duas semanas, durante sete meses, para o registro de ácaros plantícolas e para descrever a abundância e a distribuição das espécies mais importantes. O tamanho e a idade dos pomares variaram de 3.360 a 88.0080 m² e de sete a 25 anos, respectivamente. Nos 14 períodos de coleta, folhas, galhos e frutos foram coletados de uma árvore em cada pomar. No total, 3.360 folhas, 672 galhos e 1.344 frutos foram coletados de 168 árvores. Os ácaros foram extraídos dos frutos manualmente e pelo método de lavagem nas folhas e galhos. Identificamos espécies pragas com potencial de causar danos econômicos. Registramos 14 espécies de fitófagos em quatro famílias (Eriophyidae, Tarsonemidae, Tenuipalpidae, and Tetranychidae). Brevipalpus phoenicis (Geijskes 1939) (Tenuipalpidae) e Phyllocoptruta oleivora (Ashm., 1879) (Eriophyidae), as duas espécies fitófagas mais abundantes em outras regiões, foram dominantes, mostrando que a cultura de citros local é suscetível à infestação. Registramos 11 espécies de predadores das famílias Phytoseiidae e Ascidae, compreendendo 10% da população total. Phytoseiidae foi a família mais diversa, com 10 espécies. Foram discutidos aspectos da variação temporal e utilização de hábitat das espécies mais abundantes. Estudos de longo prazo, envolvendo a aplicação de acaricidas e avaliações da comunidade de ácaros, são necessários para um melhor manejo dos pomares, levando-se em consideração a fenologia das pragas-chave

    Ácaros predadores associados ao ácaro-da-erinose da lichia

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    O objetivo deste trabalho foi identificar ácaros predadores em plantas de lichia e correlacionar o desenvolvimento populacional dessas espécies com o do ácaro-da-erinose da lichia, Aceria litchii. A pesquisa foi desenvolvida no Município de Casa Branca, SP, com árvores adultas, de 12 anos de idade, da variedade Bengal. Mensalmente, de agosto de 2008 a setembro de 2009, foram coletadas folhas para avaliação dos níveis populacionais de A. litchii e de ácaros predadores. Foram registrados 6.557 indivíduos da família Phytoseiidae. A espécie mais abundante foi Amblyseius compositus (42,6%), seguida por Phytoseius intermedius (31,2%), Euseius concordis (14,1%), Amblyseius herbicolus (8,8%) e Iphiseiodes zuluagai (3,3%). O desenvolvimento populacional de A. compositus, E. concordis e I. zuluagai correlacionou-se positivamente com o de Aceria litchii, o que indica relação de predação
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