Competitive interaction between commom black bean cultivars and Euphorbia heterophylla 1

Galon, Leandro; Forte, César Tiago; Júnior, Francisco Wilson Reichert; Trevisol, Ricardo; Perin, Gismael Francisco

doi:10.1590/1983-40632018v4851669

Cited by 4 publications

(2 citation statements)

References 21 publications

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“…Currently, the problem found in soybean crops is the low efficiency in the weeds control, so that they present expressive reductions in the increase and in the development of the cultivar, as consequence occurs reduction of the grain productivity (Agostinetto et al 2009;Forte et al 2017;Galon et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Weed management in soybean using burndown herbicides associated to pre-emergent herbicides

Santin¹,

Peruzzo²,

Galon³

et al. 2019

Commun. Plant Sci.

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The soybean crop has been playing a very important role in the agribusiness worldwide, including in Brazil. Among the pests that cause major problems to the crop are the weeds, because they are responsible by the reduction of the productivity and of the grain quality. On the face of it, this work aimed to evaluate the application of burndown herbicides associated to pre-emerging herbicides to the management of the soybean weeds. The experiment was carried out in the field, in area with no soil cover with fallow during the winter, in the randomized block design, with four replicates. The treatments used were: diuron + sulfentrazone (490 + 245), [glyphosate + (diuron + sulfentrazone)-1,440 + (420 + 210)], [glyphosate + (diuron + sulfentrazone)-1,440 + (490 + 245)], glyphosate + 2,4-D (1,440 + 806), glyphosate + diclosulam (1,440 + 25.2), [glyphosate + (imazethapyr + flumioxazin)-1,440 + (100 + 50)], glyphosate + saflufenacil (1,440 + 35), [ammonium-glufosinate + (diuron + sulfentrazone)-400 + 490 + 245 g ha-1 de i.a], and two herbicide-free controls, weedy and weed-free. At the 7, 14, 21 and 28 days after the emergency of the crop (DAE) the variables were evaluated, herbicide phytotoxicity on soybean and the weeds control, Digitaria ciliaris and Urochloa plantaginea. In the soybean harvest, the number of pods per plant was determined, the number of grains per pods, the mass of a thousand grains (g) and the grain productivity (kg ha-1). The phytotoxicity caused by herbicides to the soybean it was not over to 8% in all the evaluations realized. The control of the weeds, D. ciliaris and U. plantaginea were over to 90%, highlighting the effect of the pre-emerging herbicides in the maintaining of the control until the evaluation of the 28 DAE. In general, all the treatments involving the herbicides did not cause changes in the components of soybean crop yield, being statistically equal the weed-free control higher than the weedy control. The soybean presented an increase of 859.48% in grain yield when Digitaria ciliaris and of the Urochloa plantaginea was controlled. Highlighted Conclusions 1. The control of Digitaria ciliaris and Urochloa plantaginea is more efficient with the use of pre-emerging herbicides, mainly diuron + sulfentrazone and imazethapyr + flumioxazin. 2. The toxicity of herbicides to the soybean 'NA 5909' is low, with no visual intoxication symptoms from 28 days after emergency, and do not reduce the crop grain yield. 3. Digitaria ciliaris and Urochloa plantaginea can reduce by up to 88% the soybean grain yield if not controlled. 4. The soybean grain productivity can be increased by 859% when Digitaria ciliaris and Urochloa plantaginea are controlled.

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Section: Introductionmentioning

confidence: 99%

Weed management in soybean using burndown herbicides associated to pre-emergent herbicides

Santin¹,

Peruzzo²,

Galon³

et al. 2019

Commun. Plant Sci.

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“…Agricultural crops, including onions, depend on environmental factors for their growth and development. Among the environmental and edaphic factors that influence the productivity of these crops is the interference caused by weeds, which can compete for the available resources in the environment, such as water, nutrients, light and CO2 (Galon et al, 2018). Weeds appear as an obstacle in world agricultural production, causing an increase in the cost of production, reduction in yield and quality of harvested products (Renton & Chauhan, 2017).…”

Section: Introductionmentioning

confidence: 99%

Competitive Interaction between Weeds and Onion Crop

Franceschetti¹,

Galon²,

Menegat³

et al. 2019

IJAERS

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Among the factors that affect crop productivity are weeds that compete for the resources present in the environment. Then, the objective of this study was to evaluate the competitiveness of turnip and ryegrass infesting the onion crop. The experiment was conducted in a greenhouse, in a randomized complete block design, arranged in a 2x8 factorial scheme, with four replications. In factor A, were allocated the weeds (turnip and ryegrass) and in the B, were allocated populations of these species (0, 1, 2, 3, 4, 5, 6 and 7 pot-1 plants) living with an onion plant. 50 days after transplanting, were evaluated the height, stem diameter, leaf area and dry mass of the aerial part of the onion plants. For the weeds, only the dry mass of the aer ial part was determined. In face of the results, it can be observed that the onion has a low competitive capacity, being the turnip the weed more aggressive in the competition, for all evaluated variables.

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Target site as the main mechanism of resistance to imazamox in a Euphorbia heterophylla biotype

Rojano-Delgado

Portugal

Palma-Bautista

et al. 2019

Sci Rep

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Euphorbia heterophylla is a weed species that invades extensive crop areas in subtropical regions of Brazil. This species was previously controlled by imazamox, but the continuous use of this herbicide has selected for resistant biotypes. Two biotypes of E. heterophylla from southern Brazil, one resistant (R) and one susceptible (S) to imazamox, were compared. The resistance of the R biotype was confirmed by dose-response assays since it required 1250.2 g ai ha−1 to reduce the fresh weight by 50% versus 7.4 g ai ha−1 for the S biotype. The acetolactate synthase (ALS) enzyme activity was studied using ALS-inhibiting herbicides from five different chemical families. The R biotype required the highest concentrations to reduce this enzyme activity by 50%. A Ser653Asn mutation was found in the ALS gene of the R biotype. The experiments carried out showed that imazamox absorption and metabolism were not involved in resistance. However, greater 14C-imazamox root exudation was found in the R biotype (~70% of the total absorbed imazamox). Target site mutation in the ALS gene is the principal mechanism that explains the imazamox resistance of the R biotype, but root exudation seems to also contribute to the resistance of this biotype.

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Competitive interaction between commom black bean cultivars and Euphorbia heterophylla 1

Cited by 4 publications

References 21 publications

Weed management in soybean using burndown herbicides associated to pre-emergent herbicides

Weed management in soybean using burndown herbicides associated to pre-emergent herbicides

Competitive Interaction between Weeds and Onion Crop

Target site as the main mechanism of resistance to imazamox in a Euphorbia heterophylla biotype

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