Eficácia de herbicidas em condições controladas para o controle de gramíneas infestantes de canaviais em estiagem

Giancotti, Paulo Roberto Fidelis; Toledo, Roberto; Alves, Pedro Luís da Costa Aguiar; Filho, Ricardo Victória; Negrisoli, E.; Cason, João Batista; Alves, Samuel Neves Rodrigues; Rocha, Murilo Grespan da

doi:10.7824/bhj.v11i3.202

Cited by 2 publications

(2 citation statements)

References 4 publications

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“…Takano et al (2015) observed that the use of amicarbazone and imazapic was effective at controlling Senna obtusifolia in soils with different textures during the dry season, but only in initial evaluations. A similar result was obtained by Giancotti et al (2012), who found that amicarbazone was inefficient at controlling grasses subjected to 60 days of drought.…”

Section: Experiments 2: Effect Of Drought On the Efficacy Of Residual supporting

confidence: 84%

Differential susceptibility of morning glory (Ipomoea and Merremia) species to residual herbicides and the effect of drought periods on efficacy

Ribeiro¹,

Torres²,

Ramos³

et al. 2018

Aust J Crop Sci

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The plants commonly known as morning glory belong to the genera Ipomoea and Merremia and are among the most important weeds in Brazil. Greenhouse studies were conducted in 2016/2017 to compare the susceptibility of different morning glory species-Ipomoea quamoclit, I. nil, I. hederifolia, I. triloba, Merremia aegyptia, and M. cissoides to soil-applied herbicides and to evaluate the effectiveness of these herbicides after periods of drought. In the first experiment, to evaluate the efficacy of each herbicide at pre-emergence stage, a fully randomized 6 (doses) x 6 (species) factorial experimental design with six replicates was used. The herbicides tebuthiuron (3,200; 1,600; 800; 400; 200 and 0.0 g a.i ha-1), amicarbazone (2,100; 1,050; 750; 375; 187 and 0.0 g a.i ha-1), sulfentrazone (1,200; 600; 300; 150 75 and 0.0 g a.i ha-1), mesotrione (240; 120; 60; 30; 15 and 0.0 g a.i ha-1), saflufenacil (200; 100; 50; 25; 12 and 0.0 g a.i ha-1), and imazapic (360; 180; 90; 45; 22 and 0.0 g a.i ha-1) were applied. Ipomoea hederifolia, I. nil, and I. quamoclit were most susceptible to saflufenacil; I. triloba and M. cissoides were most susceptible to tebuthiuron; and M. aegyptia was most susceptible to amicarbazone. Therefore, the best herbicide treatment depends on the species of morning glory. In the second experiment, to determine the effectiveness of herbicides after periods of drought, the treatments were arranged, for each herbicide, in a fully randomized 6 x 5 factorial design with four replicates, six species of morning glory, and five sowing times after periods of drought (0, 15, 30, 45, and 60 days after application (DAA) of the herbicides) relative to the application of the amicarbazone (1,050 g a.i ha-1), imazapic (180 g a.i ha-1), mesotrione (120 g a.i ha-1), saflufenacil (100 g a.i ha-1), sulfentrazone (600 g a.i ha-1), and tebuthiuron (1,600 g a.i ha-1). Herbicide effectiveness after periods of drought began to decrease after 15 days for saflufenacil; 30 days for imazapic, mesotrione, and tebuthiuron; 45 days for amicarbazone; and 60 days for sulfentrazone. Preemergence application of amicarbazone and sulfentrazone exhibited consistent efficacy during the drought periods, satisfactorily controlling the species of morning glory.

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Section: Experiments 2: Effect Of Drought On the Efficacy Of Residual supporting

confidence: 84%

Differential susceptibility of morning glory (Ipomoea and Merremia) species to residual herbicides and the effect of drought periods on efficacy

Ribeiro¹,

Torres²,

Ramos³

et al. 2018

Aust J Crop Sci

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“…Therefore, these species may be the most problematic weeds for control, since the use of selective herbicides will be difficult because the crop is also grassy. However, it is known that the herbicides diuron+hexazinone+sulfometuronmethyl and amicarbazone+isoxaflutole are efficient in the control of P. maximum and B. decumbens, and diuron+hexazinone and amicabazone are selective to sugarcane in the 'Plene' system (Giancotti et al, 2012;Bertolino and Alves, 2014). Paula (2015) reported the grasses B. decumbens and P. maximum as the most aggressive species to the initial development of sugarcane plants from meristematic seedlings when compared to the species I. hederifolia and D. horizontalis; at 90 days of coexistence, the presence of 2 plants pot -1 of these species caused a reduction in dry matter accumulation of approximately 55%, 47%, 50%, and 24%, respectively.…”

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confidence: 99%

Interference Relationships Between Weeds and Sugarcane in the ‘Plene’ System

et al. 2019

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Sugarcane is one of the most important crops planted in Brazil in that the presence of weeds in the fields has promoted significant yield reduction. The objective of this work was to evaluate the differential growth response of two sugarcane varieties cropped in the ‘Plene’ system as a function of the coexistence with different weed species. Treatments consisted of the coexistence of Bidens pilosa plus Ipomoea quamoclit, Ipomoea hederifolia, Amaranthus viridis, Urochloa plantaginea, Panicum maximum, and Digitaria horizontalis with two sugarcane varieties (RB92579 and SP80-1842) cropped in the ‘Plene’ system, in addition to a control without weeds. The design was completely randomized with three replicates. Dry matter accumulation of weeds was dependent of the weed species and the sugarcane variety whose coexistence was kept. The behavior of development in terms of plant height, number of green leaves, leaf area, and dry mass of stems, roots and leaves was dependent on the sugarcane variety and on the weed species whose coexistence was kept. The weed U. plantaginea showed the greatest potential to interfere with the growth of both sugarcane varieties planted in the ‘Plene’ system. Panicum maximum and D. horizontalis are also potential competitors, while B. pilosa, I. quamoclit, I. hederifolia, and A. viridis are less competitive. The sugarcane variety RB92579 is less susceptible to weed interference than SP80-1842 when planted in the ‘Plene’ system.

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Eficácia de herbicidas em condições controladas para o controle de gramíneas infestantes de canaviais em estiagem

Cited by 2 publications

References 4 publications

Differential susceptibility of morning glory (Ipomoea and Merremia) species to residual herbicides and the effect of drought periods on efficacy

Differential susceptibility of morning glory (Ipomoea and Merremia) species to residual herbicides and the effect of drought periods on efficacy

Interference Relationships Between Weeds and Sugarcane in the ‘Plene’ System

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