Suscetibilidade de duas Gramas-boiadeiras a diferentes formulações de glyphosate

Scherner, Ananda; Avila, Luis Antônio de; Schreiber, F.; Kruse, Nelson Diehl; Agostinetto, Dirceu; Pinto, J.J.O.; Pestana, Rodrigo Ribeiro

doi:10.1590/s0103-84782014000300003

Cited by 3 publications

(4 citation statements)

References 9 publications

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“…RW GSA treatment, which constitutes the commercial product Roundup WG ® , which formulation is in ammonium salt, was what caused most poisoning plants, not significantly differing from the CRUCIP treatment which is Crucial ® and its formulation is based on potassium salt and isopropylamine salt (Table 2). In this case, greater control of benghal dayflower species was made with application of glyphosate formulation in ammonium salt, other authors also obtained similar results in similar conditions compared to other formulations in benghal dayflower weed (Oliveira et al, 2009), beggartick (Bidens pilosa) (Werlang et al, 2005) and southern cutgrass (Leersia hexandra e Luziola peruviana) (Scherner et al, 2014).…”

Section: Resultssupporting

confidence: 63%

Controle de trapoeraba com diferentes formulações de glyphosate

Carvalho¹,

José²,

Lopes³

et al. 2015

RBHerbicidas

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-Benghal dayflower (Commelina benghalensis L.) is a weed plant that easily infests agricultural areas due to its aggressive characteristics associated with reproductive aspects of the species. One important aspect of this plant is presenting its tolerance to the glyphosate. An experiment in greenhouse was conducted to verify the effects of different formulations and commercial products of glyphosate in controlling benghal dayflower. The experimental design was completely randomized, with four replications. The plants were grown in pots filled with eight liters of substrate each, consisting of soil, sand and tanned cattle manure until they have reached the stage of development of the second growth sector, when the following products and their commercial formulations were applied: Roundup Original ® -isopropylamine salt; Trop ® -isopropylamine salt; Roundup WG ® -ammonium salt; Zapp QI ® -potassium salt; Roundup Transorb R ® = potassium salt and Crucial ® -isopropylamine salt + potassium salt. The intoxication of benghal dayflower plants was visually assessed at 7, 14 and 21 days after application of the products, and leaf area, dry matter of leaves, dry matter of the stem, dry matter of root and total dry matter at 21 days after application. The treatments show significant differences in the toxicity of the plants after 14 days of application, and at 21 days it was found that the products Roundup WG ® and Crucial ® were more toxic to plants. The products Roundup WG ® and Crucial ® were highlighted with greater reductions in dry matter of the leaves, stem and total plant. In general, the benghal dayflower has not been effectively controlled by the products at the doses tested and/or by the application after the emission of the second branch of weed. Among the commercial formulations or products, the ammonium salt is highlighted -Roundup WG ® and the mixture of isopropylamine salt with potassium salt -Crucial ® presents higher efficiency in weed control. Keywords: Commelina benghalensis; isopropylamine salt; potassium salt; ammonium salt Resumo -A trapoeraba (Commelina benghalensis L.) é uma planta daninha que infesta facilmente áreas agrícolas devido à suas características de agressividade associadas aos aspectos reprodutivos da espécie. Um dos aspectos importantes desta planta apresentar é sua tolerância ao herbicida glyphosate. Um experimento em ambiente protegido foi realizado para verificar os efeitos de diferentes formulações e produtos comerciais do herbicida glyphosate no controle da trapoeraba. O delineamento experimental utilizado foi o inteiramente casualizado, com quatro 1 Received for publication on 21/10/2015 and approved on 11/01/2016.

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Section: Resultssupporting

confidence: 63%

Controle de trapoeraba com diferentes formulações de glyphosate

Carvalho¹,

José²,

Lopes³

et al. 2015

RBHerbicidas

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“…With the increase in the use of the minimum-tillage rice production as an alternative to control these species, the area of which reached 61% in last year's growing season in Brazil [8], there was an increase in the presence of perennial grasses like Luziola peruviana Juss. (Peruvian water grass) [9,10] and Leersia hexandra Sw. (rice cut-grass) [9][10][11]. These species occur in southern Brazil, inhabiting lowland areas and canals of irrigation and drainage [9].…”

Section: Introductionmentioning

confidence: 99%

“…(Peruvian water grass) [9,10] and Leersia hexandra Sw. (rice cut-grass) [9][10][11]. These species occur in southern Brazil, inhabiting lowland areas and canals of irrigation and drainage [9]. Their presence in the irrigation and drainage canals reduces water flow due to the high amount of biomass they produce [10].…”

Section: Introductionmentioning

confidence: 99%

Effect of Water Deficit on Growth and Photoassimilate Partitioning in Leersia hexandra and Luziola peruviana

Silva

Scherner²,

da-Silva

et al. 2022

Agriculture

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Minimum tillage in rice production is increasing in southern Brazil, reaching 60% of the total planted area. Compared to conventional tillage, in this system there is an increase in the occurrence of perennial weeds, such as Luziola peruviana and Leersia hexandra, which are amphibious plants, as they can occur in both flooded environments and aerobic conditions. These weeds are controlled in burn-down before rice planting by glyphosate applications, the efficacy of which depends on the soil moisture. This study aimed to evaluate the effect of different soil moisture regimes in L. hexandra and L. peruviana growth and photoassimilate partitioning. Both species were assessed under soil moisture regimes of flooded, saturated, 7 kPa, 15 kPa, 40 kPa, and 100 kPa (experiment 1) and flooded, saturated, and 7 kPa (experiment 2). Plants were sampled immediately after drainage (3 months after transplant) and 1 and 2 weeks after drainage. The results showed that as soil moisture levels decreased, growth and development parameters were negatively affected in both species. Photoassimilate partitioning was affected by water regime and differences were observed between species. The total soluble sugars and starch content decreased in the leaves, and sucrose concentration increased in the roots following drainage. Soil drainage affects the growth and alters carbohydrate partitioning of these weeds, increasing the sugar storage in roots. The agronomic impact of these findings is that this behavior may affect herbicide transport in phloem and may affect herbicide efficacy.

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“…Moreover, the absence of herbicides registered to control these species post-emergence in rice has contributed to their proliferation and consequently has increased productivity losses 3 (Scherner et al, 2014). Currently glyphosate has been used to burndown these species in the fallow season, but it has low efficiency when applied under high soil moisture and low temperatures (Noldin et al, 2002;Scherner et al, 2017), which are quite frequent in RS during this season.…”

Section: Introductionmentioning

confidence: 99%

Biochemical Alterations of Weeds in Response to Stress Caused by Herbicides and Total Plant Submersion

et al. 2018

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-The maximum biological efficiency of a herbicide is performed when the plants are in favorable condition to absorb and metabolize it. Stress situations, such as total submersion, cause stress in plants, reducing weed control efficiency and crop yield. The objective of this study was to verify whether different soil water content and herbicide treatments alter the components of the secondary metabolism and cause cellular damage in weed species Two experiments were conducted (I and II) in a completely randomized experimental design with a factorial scheme (2 x 2 x 4 and 2 x 5, respectively) and three replicates. The first experiment was conducted with two species (Leersia hexandra and Luziola peruviana), which were submitted to four herbicide treatments and soil moisture levels (field capacity and total submersion). Experiment II was performed with cockspur grass plants submitted to five herbicide treatments and the same soil moisture levels from experiment I. Leaf samples were collected for laboratory analyses seven days after establishing the soil moisture levels. Assessmentes were made for the levels of chlorophyll and carotenoids, activity of antioxidant enzymes, as well as levels of hydrogen peroxide and cellular damage. The results showed that all plant species studied showed higher oxidative stress under field capacity than under submersion. L. hexandra shows greater oxidative stress than L. peruviana regardless of the treatment applied: water regime or herbicide. Furthermore, the associations of glyphosate + clomazone and glyphosate + mixture of imazapyr + imazapic caused greater oxidative stress in L. hexandra and L. peruviana than glyphosate alone. All herbicides caused lipid peroxidation, reduced enzyme activity decreased concentrations of total chlorophyll, chlorophyll a and carotenoids on cockspur grass. Keywords: Luziola peruviana, Leersia hexandra, Echinochloa crus-galli,oxidative stress, chemical control. RESUMO -

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Suscetibilidade de duas Gramas-boiadeiras a diferentes formulações de glyphosate

Cited by 3 publications

References 9 publications

Controle de trapoeraba com diferentes formulações de glyphosate

Controle de trapoeraba com diferentes formulações de glyphosate

Effect of Water Deficit on Growth and Photoassimilate Partitioning in Leersia hexandra and Luziola peruviana

Biochemical Alterations of Weeds in Response to Stress Caused by Herbicides and Total Plant Submersion

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