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Resistance and differential susceptibility of Bidens pilosa and B. subalternans biotypes to ALS-inhibiting herbicides Scientia Agricola
López-Ovejero,Ramiro Fernando; Carvalho,Saul Jorge Pinto de; Nicolai,Marcelo; Abreu,Aluana Gonçalves; Grombone-Guaratini,Maria Tereza; Toledo,Roberto Estevão Bragion; Christoffoleti,Pedro Jacob.
The frequent application of herbicides in agricultural areas may select resistant biotypes in weed populations, whose biological characteristics influence the speed and patterns of resistance. This research aims to charactere, simultaneously, resistance patterns and differential susceptibility of Bidens pilosa and B. subalternans biotypes to ALS-inhibiting herbicides of the imidazolinone and sulfonylurea chemical groups. Six hairy beggarticks biotypes, four suspected resistant and two known susceptible, were treated with eight rates of chlorimuron-ethyl or imazethapyr, in greenhouse conditions. Percent control and percent fresh weight of the plants were evaluated at 28 days after the application. B. subalternans is less susceptible to ALS-inhibiting...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Imidazolinone; Sulfonylurea; Hairy beggarticks; Soybean.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000200005
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Reproductive biology in species of Bidens L. (Asteraceae) Scientia Agricola
Grombone-Guaratini,Maria Tereza; Solferini,Vera Nisaka; Semir,João.
Studies about reproductive biology of weed species can have implications on the establishment of controlling practices that minimize the effects of these weed populations on agricultural fields. The pollination biology of Bidens alba (L.) DC., B. pilosa L., and Bidens subalternans DC., was studied at different sites and climatic seasons. Bidens pilosa and B. subalternans are widely distributed in agricultural areas, in disturbed habitats, and along road sides. Bidens alba occur only along the coast. The three species are self-compatible and non agamospermous. The composition of the pollinator community changes during the year and between sites. Hymenopterans and lepidopterans are the most frequent visitors to Bidens species in both areas studied. Although...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Floral visitors; Pollination biology; Weed species.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000200010
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Seed rain in areas with and without bamboo dominance within an urban fragment of the Atlantic Forest Acta Botanica
Grombone-Guaratini,Maria Tereza; Alves,Luciana Ferreira; Vinha,Daniella; Franco,Geraldo Antônio Daher Corrêa.
Understanding the flow of diaspores is fundamental for determining plant population dynamics in a particular habitat, and a lack of seeds is a limiting factor in forest regeneration, especially in isolated forest fragments. Bamboo dominance affects forest structure and dynamics by suppressing or delaying the recruitment of and colonization by tree species as well as by inhibiting the survival and growth of adult trees. The goal of the present study was to determine whether dominance of the bamboo species Aulonemia aristulata (Döll) McClure in the forest understory influences species abundance and composition. We examined the seed rain at two noncontiguous sites (1.5 km apart) within an urban forest fragment, with and without bamboo dominance (BD+ and BD-...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aulonemia aristulata; Dispersal; Human activity; Natural regeneration.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000100008
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