8 documents found, page 1 of 1
Recurrent selection of popcorn composites UEM-CO1 AND UEM-CO2 based on selectio...
Vieira,Rafael Augusto; Rocha,Renato da; Scapim,Carlos Alberto; Amaral Junior,Antonio Teixeira doABSTRACT Selection indices were applied to data sets of 169 half-sib families of the popcorn composites UEM-Co1 and UEM-Co2 in four cycles of recurrent selection. From 2005 to 2008, the experiments were arranged in a 13 by 13 lattice square design, with two replications per cycle and composite. Genetic gains for popping expansion (PE) and grain yield (GY) were estimated based on several selection indices and tr...
Protective, curative and eradicative activities of fungicides against grapevine...
Angelotti,Francislene; Buffara,Claudia Regina Scapin; Tessamnn,Dauri José; Vieira,Rafael Augusto; Vida,João BatistaThe protective, eradicative and curative activities of the fungicides azoxystrobin, tebuconazole, pyraclostrobin+metiram, and ciproconazole against grapevine rust, were determined in greenhouse. To evaluate the protective activity, leaves of potted ´Niagara´ (Vitis labrusca) vines were artificially inoculated with an urediniospore suspension of Phakopsora euvitis four, eight or forteen days after fungicidal spr...
Elaboration and validation of a diagrammatic scale to assess downy mildew sever...
Buffara,Cláudia Regina Scapin; Angelotti,Francislene; Vieira,Rafael Augusto; Bogo,Amauri; Tessmann,Dauri José; Bem,Betina Perreira deThe downy mildew, caused by Plasmopora viticola, is one of the most important grapevine (Vitis vinifera) diseases in Southern Brazil, causing defoliation and economic losses. The evaluation of disease severity is an important decision for adoption of strategies and tactics for disease control. Therefore, the objective of this work was to elaborate and to validate a diagrammatic scale to assess downy mildew seve...
Progress of Asian soybean rust and airborne urediniospores of Phakopsora pachyr...
Nascimento,Jefferson Fernandes do; Vida,João Batista; Tessmann,Dauri José; Zambolim,Laércio; Vieira,Rafael Augusto; Oliveira,Ricardo Ribeiro deAsian soybean rust, caused by the fungus Phakopsora pachyrhizi, was reported at epidemic levels in 2003/2004 and is the main soybean disease in Brazil. The aim of this study was to investigate the spread of Asian soybean rust and to quantify airborne urediniospores in the region of Campo Mourão, Paraná State, Brazil. Three experiments were conducted under field conditions during the 2007/08 and 2008/09 crop sea...
Genetic analysis of tropical rust resistance in popcorn lines
Sanches,Rafael Egea; Scapim,Carlos Alberto; Tessmann,Dauri José; Vieira,Rafael Augusto; Rodovalho,Marcos de Araújo; Milani,Klayton FlávioThe objectives of this study were to identify promising popcorn lines and hybrids for genetic resistance to tropical rust (Tr, Physopella zeae) in diallel crosses of nine lines derived from a large part of Brazilian popcorn germplasm and to estimate genetic parameters for Tr resistance. Crosses and checks were tested in a random block design, with artificial inoculations under greenhouse conditions. Plots consi...
Diallel analysis of yield, popping expansion, and southern rust resistance in p...
Vieira,Rafael Augusto; Scapim,Carlos Alberto; Tessmann,Dauri José; Hata,Fernando TeruhikoTen popcorn inbred lines were crossed in a circulant partial diallel matching scheme (group of lines derived from IAC 112 × group of lines from 'Zaeli'). The hybrids were evaluated in respect to grain yield (GY), popping expansion (PE), and resistance to southern rust (Puccinia polysora, Pp), in randomized block design, with three replications. Data was examined by analyses of variance and Kempthorne and Curnow...
Levantamento da incidência de Leifsonia xyli subsp. xyli em plantios de cana-de...
Marcuz,Fernanda Santos; Souto,Eliezer Rodrigues de; Vieira,Rafael Augusto; Marrafon,Marco Aurélio; Barboza,Antônio Augusto Lazarini; Daros,EdelclaitonO raquitismo-da-soqueira, causado por Leifsonia xyli subsp. xyli é considerado uma das mais importantes doenças bacterianas da cana-de-açúcar (Saccharum spp.). Para verificar a possível ocorrência de Leifsonia xyli subsp. xyli na região noroeste do Paraná, foi realizado um levantamento em 32 áreas de plantio de duas usinas, utilizando-se o método sorológico "Dot blot" e um protocolo baseado na reação em cadeia ...
Resistência de genótipos de videira à ferrugem
Angelotti,Francislene; Scapin,Claudia Regina; Tessmann,Dauri José; Vida,João Batista; Vieira,Rafael Augusto; Souto,Eliezer Rodrigues deO objetivo deste trabalho foi avaliar a resistência à ferrugem causada pelo fungo Phakopsora euvitis, em genótipos de videira, e a eficiência da infecção de acordo com a idade das folhas e concentração de inóculo. A avaliação foi feita em 15 genótipos, com base nos seguintes componentes de resistência: número de pústulas (urédios) por cm²; tamanho das pústulas; número de esporos produzidos por pústula; e períod...