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Lavras, Brazil

The coffee leaf miner Leucoptera coffeella, (Guérin - Menèville & Perrottet, 1842) is a key pest in coffee plantations in Brazil. This pest is important because causes losses of up to 50% in the production of coffee, depending on the loss of area of the photosynthesis, as result of necrosis on the surface of the leaf. It is well known that the understanding of the spatial distribution of insects is important in the context of biological control of pests in organic production. So, the goal of this study is to use the methods proposed by Diggle et al. (1995) to analyze the spatial and temporal relationships of the intensity of infestation of the coffee-leaf-miner on an organic coffee plantation in training. For this work, it was collected, monthly, between June 2005 and March 2007, ten leaves from 35 points located in an area of one hectare of an organic coffee plantation (Coffea arábica L). Once the number of mined lives was superior to 30%, the sample point was considered infested. To analyze the spatial and temporal relationships of the intensity of infestation of the coffee leaf miner in the plantation, we used an adaptation of Ripley's K function. The method was able to identify clearly the absence of space-time interaction in the infestation of the coffee leaf miner and an evident cluster behavior in time. We conclude that the location of the infestation is independent of the month which it occurred. Source


Alemu Setotaw T.,Federal University of Vicosa | Alemu Setotaw T.,Plant Biotechnology Laboratory | Teixeira Caixeta E.,Embrapa Cafe UFV | Alves Pereira A.,Empresa de Pesquisa Agropecuaria de Minas Gerais Epamig | And 5 more authors.
Crop Science | Year: 2013

The coefficient of parentage among 121 cultivars of Coffea arabica L. in Brazil released from 1939 to 2009 was estimated and used to study the genetic diversity and the breeding pattern of the breeding programs. A low genetic diversity was observed within the C. arabica cultivars of Brazil. The genetic base of 121 cultivars released in Brazil between 1939 and 2009 was defined by 13 ancestors. Seven ancestors contribute with 97.55% of the genetic base of C. arabica cultivars. Bourbon Vermelho contributed with 52.76% for the genetic pool of the C. arabica cultivars of Brazil followed by Sumatra (19.05%) and Híbrido de Timor (11.59%). Mundo Novo and Icatu Vermelho contributed with 87.65% for the genetic base of the C. arabica cultivars. It was calculated that 97.55% of the genetic base of the Brazilian C. arabica cultivars is derived from seven ancestors, indicating a narrow genetic base. Among the first progenies, Mundo Novo contributed with 69.39% of the genetic base of C. arabica cultivars in Brazil. The increase in the genetic diversity among C. arabica cultivars observed in recent decades is due to the introduction of parental lines with diverse genetic base. High genetic diversity was observed among cultivars released by Empresa de Pesquisa Agropecuária de Minas Gerais/Universidade Federal de Viçosa, Fundação Procafé, and Instituto Agronômico do Paraná. The 121 Brazilian cultivars were clustered into four groups based on coefficient of parentage. The distributions of genotypes over the cluster groups showed the effect of parental line contribution. © Crop Science Society of America. Source


De Oliveira Bernardi L.F.,Federal University of Lavras | Zacarias M.S.,Embrapa Cafe EPAMIG | Ferreira R.L.,Federal University of Lavras
Zootaxa | Year: 2012

A new species of the genus Neocarus, Neocarus potiguar n. sp., is described from caves and the epigeal environment of the Apodi Carbonatic Group, northeast Brazil. This new species is distinguished by the presence of smooth setae on the basal portion of the evaginated ovipositor, 25-27 ch-type setae on the palp tarsus and one (rarely two) setae on the pregenital area of the adult female. Copyright © 2012 · Magnolia Press. Source


Bernardi L.F.D.O.,Federal University of Lavras | Silva F.A.B.,Federal University of Para | Zacarias M.S.,Embrapa Cafe EPAMIG | Klompen H.,Ohio State University | Ferreira R.L.,Federal University of Lavras
Invertebrate Systematics | Year: 2013

The mite order Opilioacarida is widely distributed in the tropical and sub-tropical zones of the world, where it is rare and poorly known. On the American continent only two genera, 14 species and one subspecies are known. This work aimed to describe a new species of Caribeacarus from the state of Pará, in the eastern part of the Brazilian Amazon. A phylogenetic analysis of the species in this genus is also presented, and interpreted along with the historical biogeography of this genus in Central and South America. A key to the species of Caribeacarus is provided. © 2013 CSIRO. Source

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