AVALIAÇÃO DE HERBICIDAS PARA O CONTROLE DE Chloris distichophylla

Aguiar, Adalin Cézar Moraes de; Cutti, Luan; Silva, Diecson Ruy Orsolin da; Kaspary, Tiago Edu; Muraro, Dionei Schmidt; Rieder, Eduardo; Rigon, Carlos Alberto Gonsiorkiewicz

doi:10.21757/0103-3816.2017v29n1p69-74

Cited by 2 publications

(3 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The appearance of a new resistant species such as C. distichophylla demonstrates the difficulty that farmers face due to a lack of knowledge and tools that are as effective as glyphosate available to combat the serious problem of resistance in Brazil. Studies conducted by Nunes et al [7] and Moraes de Aguiar et al [8] showed that C. distichophylla had been selected in areas treated with glyphosate, due to its possible natural tolerance. Nevertheless, there have been reports confirming resistance levels or mechanisms involved that classify it as resistant or tolerant, which is a function of whether there is a population considered susceptible.…”

Section: Discussionmentioning

confidence: 99%

“…Nees], commonly known as false-star-grass or weeping fingergrass, is found in areas where soybean and fruit crops are grown in southern Brazil [7]. Losses in soybean productivity can reach a 70% decrease when the soybean competes with Chloris polydactila, confirming the need to control the species of the same genus [8].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the genus Chloris species is the main focus of many farms, since it is naturally tolerant of glyphosate herbicide [8][9][10][11]. Authors, such as Nunes et al [7] and Moraes de Aguiar et al [8], report concerns about the presence of C. distichophylla and its ability to spread to other crops where they survive from glyphosate herbicide applications.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

New Case of False-Star-Grass (Chloris distichophylla) Population Evolving Glyphosate Resistance

et al. 2020

View full text Add to dashboard Cite

Chloris distichophylla, suspected of glyphosate resistance (GR), was collected from areas of soybean cultivation in Rio Grande do Sul, Brazil. A comparison was made with a susceptible population (GS) to evaluate the resistance level, mechanisms involved, and control alternatives. Glyphosate doses required to reduce the dry weight (GR50) or cause a mortality rate of 50% (LD50) were around 5.1–3 times greater in the GR population than in the GS population. The shikimic acid accumulation was around 6.2-fold greater in GS plants than in GR plants. No metabolized glyphosate was found in either GR or GS plants. Both populations did not differ in the enzyme 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS) basal activity or in vitro inhibition of EPSPS activity by glyphosate (I50). The maximum glyphosate absorption was observed at 96 hours after treatment (HAT), which was twofold higher in the GS plants than in the GR plants. This confirms the first case of glyphosate resistance in C. distichophylla. In addition, at 96 HAT, the GS plants translocated more 14C-glyphosate than the GR ones. The best options for the chemical control of both C. distichophylla populations were clethodim, quizalofop, paraquat, glufosinate, tembotrione, diuron, and atrazine. The first case of glyphosate resistance in C. distichophylla was due to impaired uptake and translocation. Chemical control using multiple herbicides with different modes of action (MOA) could be a tool used for integrated weed management (IWM) programs.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

New Case of False-Star-Grass (Chloris distichophylla) Population Evolving Glyphosate Resistance

et al. 2020

View full text Add to dashboard Cite

show abstract

Confirmation of Multiple Resistant Chloris radiata Population, Harvested in Colombian Rice Fields

et al. 2021

View full text Add to dashboard Cite

This paper reports the first C. radiata population with resistance to glyphosate and multiple resistance to the acetolactate synthase (ALS) inhibitor, imazamox. Two populations, one putative resistant (R) and one susceptible (S), were used in the studies. Dose–response experiments were performed to evaluate the resistance factor (RF). Shikimic acid accumulation, 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS) and ALS enzyme activities were studied together with chemical integrated weed management (adjuvants and alternative herbicides). The resistance to glyphosate and imazamox was confirmed based on the dry weight reduction, visual evaluation and survival. The results of dose–response curve assays showed for the R population intermedium RF for glyphosate (5.1 and 9.7 for amount of herbicide needed to reduce the dry weight by 50% GR50 and lethal dose of 50% LD50, respectively) and high RF for imazamox (34.9 and 37.4, respectively). The low shikimic acid accumulation in R population confirmed the glyphosate resistance. The glyphosate concentration which inhibited the EPSPS enzyme in 50% (I50) was approximately 20 times higher for R population than the S population, while the imazamox I50 in ALS enzyme for the R plants was 89 times greater than the S plants. In the chemical integrated weed management, the foliar retention and effectivity assays showed that the use of adjuvants improves the retention of glyphosate and imazamox, and the reduction in dry weight of weeds. The alternative herbicides study showed that the acetyl-CoA carboxylase (ACCase) inhibitors, paraquat and glufosinate, had better results for control in this species. However, poor control was observed with bispyribac-sodium, metsulfuron-methyl and quinclorac, indicating possible cross-resistance for ALS-inhibitors and also multiple resistance for auxinic herbicides (quinclorac). Nevertheless dose–response experiments are required to confirm this assumption.

show abstract

AVALIAÇÃO DE HERBICIDAS PARA O CONTROLE DE Chloris distichophylla

Cited by 2 publications

References 5 publications

New Case of False-Star-Grass (Chloris distichophylla) Population Evolving Glyphosate Resistance

New Case of False-Star-Grass (Chloris distichophylla) Population Evolving Glyphosate Resistance

Confirmation of Multiple Resistant Chloris radiata Population, Harvested in Colombian Rice Fields

Contact Info

Product

Resources

About