A new variety of the weed <i>Borreria densiflora</i> DC. (Rubiaceae)

Martins, Bianca Assis Barbosa; Cabral, Elsa Leonor; Souza, Vinícius Castro; Christoffoleti, Pedro Jacob

doi:10.1111/j.1445-6664.2009.00352.x

Cited by 5 publications

(5 citation statements)

References 16 publications

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“…Esta planta daninha pertence à família Rubiaceae, e foi classificada como Borreria densiflora var. latifolia, uma nova variedade da espécie Borreria densiflora, em um recente estudo taxonômico (Martins et al, 2009). Esta nova variedade possui habitat terrestre e, quanto ao ciclo de vida, é perene simples, ou seja, seu ciclo de vida ultrapassa o período de um ano e se reproduz somente por meio de sementes.…”

Section: Introductionunclassified

Germinação de Borreria densiflora var. latifolia sob condições controladas de luz e temperatura

et al. 2010

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RESUMO -A germinação é um processo fundamental na dinâmica populacional das plantas daninhas. Sendo assim, a presente pesquisa teve como objetivo analisar a interação entre temperatura e luz sobre a germinação de uma nova variedade da planta daninha vassourinhade-botão (Borreria densiflora var. latifolia), sob condições de câmara de germinação. Foi estudada a influência de cinco temperaturas (20, 25, 30 Palavras-chave: velocidade de germinação, sementes, biologia, soja, cana-de-açúcar.ABSTRACT -Germination is a fundamental process in weed population dynamics. Thus, this research aimed to evaluate the interaction between temperature and light upon the germination of a new variety of the weed vassourinha-de-botão (Borreria densiflora var. latifolia), under germination chamber conditions. The influence of five temperatures (20, 25, 30 and 35 o C constant and alternated 20-30 o C), in presence of 12h-photoperiod and constant dark conditions upon the germination was studied, under a randomized complete-block design, with four replications. Accumulated germination percentage and germination speed were evaluated, being the latter evaluated through the germination speed index. Data were submitted to analysis of variance through F test, followed by Tukey test at probability of 0.05. Germination occurred preferentially in presence of light, with significant interaction only between temperature and presence of light. We observed, thus, the positive photoblastism of this new variety of B. densiflora. The highest germination percentage occurred under the alternated temperature 20-30

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Section: Introductionunclassified

Germinação de Borreria densiflora var. latifolia sob condições controladas de luz e temperatura

et al. 2010

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“…This weed is a simple perennial species within the Rubiaceae family and belongs to the genus Borreria G. Mey. Thermal amplitudes, temperatures above 25 o C, presence of light and capacity of regrowth after cutting influence the population dynamics of B. densiflora (Martins et al, 2009(Martins et al, , 2010). …”

Section: Introductionmentioning

confidence: 99%

Herbicide efficacy on Borreria densiflora control in pre- and post-emergence conditions

Martins

Christoffoleti

2014

Planta daninha

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-The weed Borreria densiflora is a management issue in soybean and sugarcane crops from North and Northeastern Brazil. Knowledge upon chemical control of B. densiflora contributes to the integrated management of this weed species, especially when active ingredient options become reduced due to the selection of herbicide resistant or tolerant weed species. Experiments in pre-and post-emergence of B. densiflora were conducted in greenhouse, in a randomized block design and four replications. In pre-emergence, the doseresponse curve methodology was used and 7 herbicides were tested. In post-emergence, 9 herbicides at the recommended rate and 4 herbicide mixtures were tested. For pre and post-emergence conditions, evaluations were conducted at 60 and 21 days after treatment (DAT), respectively, and the variables analyzed were weed control and dry weight (%). The results showed options of pre-emergent herbicides that can be used for controlling B. densiflora, especially in sugarcane, where chemical weed control is mainly based on preemergent applications. In the current glyphosate resistance scenario, one should consider the use of pre-emergent herbicides within an integrated management of B. densiflora. For satisfactory post-emergence control, B. densiflora plants should be sprayed at the phenological stage of up to three pairs of leaves. Herbicide mixtures have been and will continue to be an important tool in chemical weed management, broadening the spectrum of weed control, while diversifying herbicide mechanisms of action, which helps to prevent or delay the appearance of herbicide resistance.Keywords: vassourinha-de-botão, chemical control, dose-response, herbicide mixtures, integrated weed management. Palavras-chave: vassourinha-de-botão, controle químico, dose-resposta, mistura de herbicidas, manejo integrado de plantas daninhas. RESUMO -A planta daninhaMARTINS, B

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“…Buttonweed glomerules are formed by fruits (Martins et al, 2009). At maturity, when the glomerules are dry, the seeds come out of the fruits easily.…”

Section: Methodsmentioning

confidence: 99%

“…), known in Brazil as vassourinha-de-botão, is a management issue in soybean and sugarcane areas from north-central Brazil. High buttonweed infestations have been reported in soybean areas under no-tillage and in cultivated sugarcane (Martins et al, 2009). This weed is considered a difficultto-control species, which colonizes cultivated and fallow areas.…”

Section: Introductionmentioning

confidence: 99%

Buttonweed emergence as affected by seed burial depth and straw on the soil surface

Martins

Christoffoleti

2015

Sci. agric. (Piracicaba, Braz.)

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Knowledge of the effects of seed burial depth and the presence of straw on the soil surface on weed seedling emergence provides useful information for the development of weed management tactics. Buttonweed (Borreria densiflora DC.) is a troublesome weed that occurs in large infestations in soybean and sugarcane crops from north-central Brazil. This study investigated buttonweed emergence at different seed burial depths and straw amounts present on the soil surface. The experiment was conducted in greenhouse conditions, under a factorial design between four seed burial depths and four amounts of surface straw. Percent seedling emergence and fresh biomass (g) were evaluated at twenty-five days after installation (DAI). Greater buttonweed emergence occurred in seeds that were placed on the soil surface either without surface straw or with up to 1,000 kg ha −1 of straw on the soil surface. With 4,000 kg ha −1 of surface straw, buttonweed emergence was prevented when seeds were placed at a depth of 0.5 cm or deeper in the soil. These data indicated emergence of this weed species was greater at depths near the soil surface and in soils with the least amounts of surface straw. Information generated in this study provides a starting point for the development of knowledge for understanding the biology of buttonweed emergence and its population dynamics. Such information may be directly transmitted to growers and lays the groundwork for an integrated management approach for this weed species.

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A new variety of the weed Borreria densiflora DC. (Rubiaceae)

Cited by 5 publications

References 16 publications

Germinação de Borreria densiflora var. latifolia sob condições controladas de luz e temperatura

Germinação de Borreria densiflora var. latifolia sob condições controladas de luz e temperatura

Herbicide efficacy on Borreria densiflora control in pre- and post-emergence conditions

Buttonweed emergence as affected by seed burial depth and straw on the soil surface

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