Multiple resistance of Conyza sumatrensis to Chlorimuronethyl and to Glyphosate

Santos, Gizelly; Oliveira, Rubem Silvério de; Constantin, Jamil; Francischini, Alessandra Constantin; Osipe, Jethro Barros

doi:10.1590/s0100-83582014000200019

Cited by 46 publications

(68 citation statements)

References 14 publications

(12 reference statements)

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“…As for the application periods within treatments, the first period (13 DBS) had better weed control than the last one (1 DAS) for glyphosatediisopropylamine salt and glyphosate-potassium salt treatments (Table 1). It was observed that the glyphosate herbicide has difficulty in controlling some weeds with increased tolerance/resistance at an advanced vegetative stage (Placido et al, 2013;Santos, 2014;Christoffoleti et al, 2005). (Trezzi et al, 2010).…”

Section: Resultsmentioning

confidence: 99%

“…biotypes collected in Parana and studied by Trezzi et al (2010) showed higher resistance factors than those already classified as resistant in the country. Moreover, in Cascavel and Tupãssi municipalities Conyza sumatrensis (Retz) E. Walker species biotypes with multiple resistances to glyphosate and chlorimuron-ethyl were found (Heap, 2014;Santos, 2014).…”

Section: Resultsmentioning

confidence: 99%

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Época de aplicação de dessecantes em pré-emergência na soja convencional

et al. 2015

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-The weed management in soybean cultures stands out as an important tool to ensure its high yield potential. The direct tillage advent increased the importance of management performed in the soybean off season and pre-seeding, in order to avoid the weeds interference in the initial cultivation period. The survey was conducted in order to evaluate the weeds control and the agronomic performance of conventional soybean, using different desiccant herbicides. The experiment was conducted in randomized blocks design with four replications. Treatments were arranged in factorial 4x3, the first factor being the glyphosate herbicides applicationdiisopropylamine salt; glyphosate -potassium salt, glyphosate isopropylamine-salt + 2,4-D; and paraquat + diuron, the second factor the application time periods (13 and 7 days before seeding -DBS; and 1 day after seeding -DAS). The percentage of weed control, booth, seedling emergence, plants height, number of pods, mass of hundred seeds and productivity were evaluated. Only the management desiccation with glyphosate near the seeding time showed a decrease in the weeds control percentage, the glyphosate + 2,4-D use led to a decrease in the early crop growth, due to seeding proximity, the paraquat + diuron application near the seeding season caused a lower insertion of the first pod in the culture. There were no significant differences between treatments for soybean production components under these experimental conditions.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Época de aplicação de dessecantes em pré-emergência na soja convencional

et al. 2015

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“…However, in no-tillage systems, soil rotation is replaced by the use of herbicides, which, when used repeatedly and incorrectly, select resistant biotypes. Resistance to glyphosate was observed for the horseweed species C. bonariensis (Vargas et al 2007) and C. canadensis (Moreira et al, 2007), as well as multiple resistance to EPSPs and ALS inhibitors for C. sumatrensis (Santos et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Longevity of Horseweed Seed Bank Depending on the Burial Depth

et al. 2018

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-Horseweed (Conyza spp.) is considered as one of the major weeds occurring in the agricultural areas of South America, especially in Brazil. This species stands out from the other weeds due to characteristics such as large seed production, continued seed production, dispersion over long distances and resistance to 5-enolpyruvoylshikimate 3-phosphate (EPSP) and acetolactate synthase (ALS) inhibiting herbicides, features that increase their management. Therefore, this study aimed at determining the physiological quality and longevity of horseweed seeds over 12 months. The experiment was established under field conditions, using a randomized block design with four replications. Fifty horseweed seeds were distributed into 50 g of dry soil, placed in permeable nylon mesh bags (10 x 10 cm), which were buried at 1, 2, 4 and 8 cm of depth. Each month, for 12 months, samples were collected and washed with water, and the remaining seeds were submitted to germination test. The percentage (%) of remaining seeds, germination, abnormal seedlings, dead seeds, dormancy and viability were evaluated. It was found that the horseweed seed bank was reduced by 59 % over 12 months. Moreover, horseweed seeds develop a secondary dormancy, regardless of the burial depth. In addition, an increased burial depth increases longevity and physiological seed quality.Keywords: Conyza spp., survival, dormancy, germination, viability. RESUMO -

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“…C. bonarensis is considered a species difficult to control because of its invasive potential in several crops and due to resistance to herbicides, including the glyphosate which excels. In Brazil, there are records of C. bonariensis (Vargas et al 2007;Lamego and Vidal 2008), C. canadensis (Moreira et al 2007) and C. sumatrensis (Santos et al 2014) resistant to herbicides.…”

Section: Introductionmentioning

confidence: 99%