Período Anterior a Interferência De Plantas Daninhas Em Soja Transgênica

Benedetti, José Guilherme Rehder; Pereira, Larissa Quinto; Alves, Pedro Luís da Costa Aguiar; Yamauti, Micheli Satomi

doi:10.5380/rsa.v10i4.14801

Cited by 5 publications

(5 citation statements)

References 9 publications

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“…There was a greater predominance of families of dicotyledonous plants (88%) than monocotyledons (22%) in population weed species (Table 1). The weed families found in this study resemble those identified in the soybean crop (Benedetti et al, 2009), cassava (Marques et al, 2010;Cardoso et al, 2013) and coffee (Maciel et al, 2010). The first three authors reported that the Asteraceae family was the owner of a large number of species.…”

Section: Resultssupporting

confidence: 67%

Evaluation of weed changes according to different fertilization management systems, through phytosociological analyzes in lettuce and carrot

et al. 2020

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The population dynamics of weeds due to different fertilization management systems is essential in the agricultural areas for the understanding of their interference and possible damages. The objective of this study was to evaluate the influence of different fertilization management systems on the weed community through phytosociological analyzes in lettuce and carrot crops grown in succession. The experimental design was a randomized block design, with eight treatments and four replications in each plant, following the same experimental layout. The treatments, referring to different management of fertilization were: Conventional; With Weeds; No Weeds; Compound; Crotalaria; Crotalaria more Compound; Lab-Lab and Lab-Lab + Compound. During cultivataion of lettuce and carrot, we collected more than 3,000 weed specimens, representing 25 species distributed in 11 families, 88% dicotyledonous and 22% monocotyledonous. The weed families with the highest value of importance in all stages of collection were Asteraceae, Brassicaceae and Poaceae. The most representative species in the area were Eleusine indica, Cyperus rotundus L., Galinsoga parviflora, Richardia brasiliensis, Oxalis latifolia, Cynodon dactylon and Conyza canadensis. The different forms of fertilization and use of cover crops were able to promote changes in the weed community and decrease in the population density during the experimental period. The treatments contributed to reduce the daily amplitudes of thermal and water changes and the incidence of sunlight on the surface layer of the soil, delaying the emergence of these weeds and contributing to other soil benefits inherent to the use of each type of fertilization.

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Section: Resultssupporting

confidence: 67%

Evaluation of weed changes according to different fertilization management systems, through phytosociological analyzes in lettuce and carrot

et al. 2020

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“…The weed interference in soybean during all the crop cycle reduces yield 73 to 94% in different sowing times (Zandona, et al, 2018). Considering a 5% tolerable yield decline, the soybean crop was negatively affected by weed infestation starting at 25 DAE (PAI) (Benedetti et al, 2009). The inefficient poaceous weed control provided by the control without herbicide and resulting increase in weed interference with the soybean crop caused a significant decrease in seed yield (600 to 1400 kg ha -1 ) (Purí ssimo, 2002).…”

Section: Soybean Yieldmentioning

confidence: 99%

New Formulation of Clethodim/Adjuvant at Control of Grass Weeds for Soybean Crops

Betto

Dysarz

Cinelli

et al. 2020

JAS

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The use of ACCase-inhibiting herbicides without the correct addition of an adjuvant is a major cause of inefficient poaceous weed control. As such, this study aimed to assess the efficiency of a new clethodim/adjuvant formulated mixture in postemergence weed control for soybean crops. Two field experiments were conducted in the 2015/16 and 2016/17 growing seasons. A randomized block design, consisting of ten treatments with four repetitions, was used. The treatments and doses were: clethodim (108 g a.i. ha-1) + Lanzar® (0.5%), clethodim (108 g a.i. ha-1) + Nimbus® (0.5%), clethodim/adjuvant formulation at doses of (84 g a.i. ha-1), (96 g a.i. ha-1), (108 g a.i. ha-1), (120 g a.i. ha-1), (132 g a.i. ha-1), and (144 g a.i. ha-1), and a control with and without weeding. The formulated clethodim/adjuvant mixture showed high control at 7 days after application (DAA) in the 2015/16 growing season. At 28 DAA, formulation doses of 108 g a.i. ha-1 and higher exhibited superior weed control and the highest crop yields. Therefore, the use of correct adjuvant or formulated mixture is essential to increase the efficiency of clethodim herbicide.

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“…Goosegrass (Eleusine indica) infests several crops and may cause irreversible damage on yield, specially when competing in the initial stages of the crops (Benedetti et al, 2009). Worldwide, this weed has 29 cases of resistance belonging to seven mechanisms of action, with 11 cases of resistance to glyphosate being reported.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Mechanism Responsible for the Low-Level Resistance to Glyphosate in Goosegrass

et al. 2017

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-Goosegrass (Eleusine indica) infests various crops, being reported as low-level resistant (LLR) to glyphosate. The objectives of this study were to evaluate the mechanisms of resistance to glyphosate in goosegrass by the cyt-P450 complex to identify changes in leaf anatomy of these plants and quantify the accumulation of shikimate in biotypes susceptible and with LLR. The metabolic rate was assessed by applying the cyt-P450 malathion inhibitor 30 minutes before the herbicide application. The analysis of the leaf anatomy consisted of a characterization of anatomic cross-sections and evaluation of the effect of glyphosate on the leaf epidermis and the conducting vessels. Plant tissue was collected 24 hours after treatment (HAT) of the dose-response curve to evaluate the accumulation of shikimate. The LLR biotype has not shown glyphosate metabolism by the early application of malathion due to the control of about 65% with or without applying the inhibitor. There is no anatomical evidence to determine the differential absorption of glyphosate by LLR biotypes. However, there is evidence of lower absorption and translocation of glyphosate in this biotype by lower stomatal density and a smaller diameter of the phloem. However, the LLR biotype presents diameter of phloem of 0.027 mm and stomatal density of 91.23 mm -2 , values which are below the observed ones on the susceptible biotype. The susceptible biotype presents shikimate accumulation 17% higher compared to the biotype with LLR at a dose of 1,080 g e.a. ha -1 , allowing to infer that the resistance mechanism is related to the enzyme insensitivity to the herbicide, which enables the use of appropriate management practices to control this weed.Keywords: cyt-P450 monooxygenase, shikimate, absorption and translocation, EPSPs, Eleusine indica. RESUMO -O capim-pé-de-galinha (Eleusine indica) é infestante de diversos cultivos, sendo relatado como resistente de nível baixo (RNB) ao herbicida glyphosate. Os objetivos deste trabalho foram avaliar mecanismos de resistência de capim-pé-de

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Período Anterior a Interferência De Plantas Daninhas Em Soja Transgênica

Cited by 5 publications

References 9 publications

Evaluation of weed changes according to different fertilization management systems, through phytosociological analyzes in lettuce and carrot

Evaluation of weed changes according to different fertilization management systems, through phytosociological analyzes in lettuce and carrot

New Formulation of Clethodim/Adjuvant at Control of Grass Weeds for Soybean Crops

Evaluation of the Mechanism Responsible for the Low-Level Resistance to Glyphosate in Goosegrass

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