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Estimating Yield Losses in Soybean Due to Sourgrass Interference Planta Daninha
GAZZIERO,D.L.P.; ADEGAS,F.S.; SILVA,A.F.; CONCENÇO,G..
ABSTRACT: Efficient management of sourgrass is one of the main challenges faced by Brazilian soybean farmers. Biological and ecological characteristics of this weed, as well as wide distribution of glyphosate-resistant biotypes, make it difficult to control this species. The objective of this work was to estimate interference of sourgrass in soybean yield. Seven experiments were conducted during three consecutive years (2012/2013, 2013/2014 and 2015/2016 cropping seasons); six of them were on-farm trials where sourgrass infestation was mainly originated from clump regrowth, while infestation originated from seeds in one trial. Data from all sites and experiments were submitted to a combined analysis, according to the study factors and variables, to...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Digitaria insularis; Perennial; Glyphosate-resistant weed; Glycine max.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100246
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Paraquat Resistance of Sumatran Fleabane (Conyza sumatrensis) Planta Daninha
ZOBIOLE,L.H.S.; PEREIRA,V.G.C.; ALBRECHT,A.J.P.; RUBIN,R.S.; ADEGAS,F.S.; ALBRECHT,L.P..
ABSTRACT: In Brazil, some populations of Conyza bonariensis and C. canadensis are glyphosate resistant and there are populations of C. sumatrensis (Sumatran fleabane) presenting multiple resistance to both glyphosate and chlorimuron. During the 2014/2015 and 2015/2016 seasons, growers reported failures to control Sumatran fleabane with paraquat. This study investigated the potential of paraquat resistant Sumatran fleabane populations in Paraná state, Brazil. Populations with suspected paraquat resistance were tested in the field in 2016 season. In 2017, seeds from these populations were collected, sown and grown in a greenhouse. Paraquat dose-response curve experiments were performed in Mogi Mirim, SP; Londrina, PR and Palotina, PR using doses of 0, 50,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Control; Dose-response; PSI inhibitor.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100218
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