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Guaíba, Brazil

Candido T.,Federal University of Vicosa | da Silva A.C.,Federal University of Vicosa | Guimaraes L.M.S.,Federal University of Vicosa | Ferraz H.G.M.,Federal University of Vicosa | And 2 more authors.
Tropical Plant Pathology | Year: 2014

A new foliar disease caused by Teratosphaeria pseudoeucalypti on eucalyptus (E. globulus, E. urophylla x E. globulus and E. nitens x E. globulus) in Brazil is described. The disease is characterized by leaf spots of variable sizes and shapes, resulting in leaf blight and premature defoliation. Based on the morphological characteristics and multilocus phylogenetic analysis of the EF-1α, β-T and ITS-2 gene regions of five isolates, the fungus was identifed as T. pseudoeucalypti. This is the first report of this pathogen outside Australia and a method for sporulation in culture is described. © 2014, Sociedade Brasileira de Fitopatologia. All rights reserved.

Martinez D.T.,UFMT | Resende M.D.V.,EMBRAPA - Empresa Brasileira de Pesquisa Agropecuaria | Costa R.B.,UFMT | Higa A.R.,Federal University of Parana | And 2 more authors.
Floresta | Year: 2012

This study evaluated genetic parameters, heterogeneity of residual variances and genotype x environment interaction, comparing the results obtained by Blup and Blup-Het procedures in Pinus taeda L. progeny tests. Experiments were set in random blocks with 150 treatments. Three experiments were located in Santa Catarina state and two were set in Paraná state, Brazil, with 5 and 9 blocks per site, respectively, and six plants per plot. At 6 years old, the progenies were evaluated for height and diameter. In general, results demonstrated that high residual variance lead to variance heterogeneity. When variances are associated to high genetic correlations among height and diameter characters, they indicate that Blup-Het procedure should be used, even if they present similar results, because genetic parameters estimated based on individual heritability for progeny is more accurate. Genotype x environment interaction was low, given similarities among progeny variance and similarity components, selected by adaptability, stability and productivity criteria. The genetic improvement program may be conducted at one site, due to the environments similarities, as demonstrated by effects from genotype x environment interaction determination coefficient and genetic correlations across sites.

Magistrali I.C.,Federal University of Santa Maria | Costa E.C.,Federal University of Santa Maria | Garlet J.,Federal University of Santa Maria | Boscardin J.,Federal University of Santa Maria | And 2 more authors.
Ciencia Rural | Year: 2013

This research aimed to record the damage caused by eucalyptus-defoliating caterpillars located in Rio Grande do Sul States, Brazil. The specie was determined as Nystalea nyseus (CRAMER, 1775) (Lepidoptera: Notodontidae). The caterpillars of this species cause defoliation in eucalyptus trees. This is the frst record of Nystalea nyseus from eucalyptus plantation in the Rio Grande do Sul State, Brazil.

Cargnelutti Filho A.,Federal University of Santa Maria | Beltrame R.,Federal University of Pelotas | Bisognin D.A.,Federal University of Santa Maria | Lazarotto M.,Federal University of Santa Maria | And 3 more authors.
Ciencia Rural | Year: 2016

In eucalyptus crops, it is important to determine the number of plants that need to be evaluated for a reliable inference of growth. The aim of this study was to determine the sample size needed to estimate average trunk diameter at breast height and plant height of inter-specific eucalyptus hybrids. In 6,694 plants of twelve inter-specific hybrids it was evaluated trunk diameter at breast height at three (DBH3) and seven years (DBH7) and tree height at seven years (H7) of age. The statistics: minimum, maximum, mean, variance, standard deviation, standard error, and coefficient of variation were calculated. The hypothesis of variance homogeneity was tested. The sample size was determined by re sampling with replacement of 10,000 re samples. There was an increase in the sample size from DBH3 to H7 and DBH7. A sample size of 16, 59 and 31 plants is adequate to estimate DBH3, DBH7 and H7 means, respectively, of inter-specific hybrids of eucalyptus, with amplitude of confidence interval of 95% equal to 20% of the estimated mean. © 2016, Universidade Federal de Santa Maria. All rights reserved.

Londero E.K.,Rua Coriolano Coelho de Souza | Schumacher M.V.,Federal University of Santa Maria | Szymczak D.A.,Federal Technological University of Parana | Araujo E.F.,CMPC Celulose Riograndense
Ciencia Florestal | Year: 2015

The study aimed to calibrate the model 3-PG for Eucalyptus saligna for the following the diameter variables at breast height (DBH), total height, wood volume and branch, bark and wood biomass. The study took place in the region of Guaíba, Rio Grande do Sul state, Brazil. Clonal plantations of Eucalyptus saligna in various spacings were used. Six different ages were selected along the crop cycle (2nd to 7th year). After the forest inventory was carried out, the biomass of three trees fractionated into wood, bark, branches and leaves was collected. The biomass of roots on the average tree of each plot was measured to a depth of 1 m. Physical and chemical analyses were performed in soil samples from the layers: 0 to 20 cm, 20 to 40 cm and 40 to 100 cm. Litter deposition was estimated by allocating 4 square collectors of 0.5 m2. The leaf area was obtained through digital photographs and thus the specific leaf area was estimated. The physiological parameters were measured in six plots, one at each age. Climatic parameters were provided by EEA of UFRGS University, located in Eldorado do Sul, RS state. The model validation was not statistically accepted, but their estimated data can be used to estimate the studied variables, demonstrating the potential of its use although additional studies for the application of the model to this species are still needed. © 2015, Universidade Federal de Santa Maria. All rights reserved.

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