Estratégias de controle de Conyza spp. em pré-plantio da soja: Aplicações únicas ou sequenciais?

Silva, Paulo Vinícius da; Costa, Pedro Henrique de Souza Menezes da; Oliveira, Matheus Vieira Barbosa de; Barros, Daniela Maria; Molina, Daniel Zamignan; Carvalho, Roque Dias de; Monquero, Patrícia Andréa; Júnior, Edmundo Inácio

doi:10.33448/rsd-v10i8.16995

Cited by 6 publications

(7 citation statements)

References 17 publications

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“…with heights greater than 10 cm was not su cient to establish adequate control. Similar data were also obtained by Da Silva et al 29 , who applied 2.4 D + glyphosate (975 + 1025 g ai ha − 1 ) in the control of Conyza spp. in plants taller than 20 cm and obtained a maximum control of 55%.…”

Section: Discussionsupporting

confidence: 88%

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Changes in leaf structure and control of Conyza spp. by herbicides applied in the presowing desiccation of soybean

Silva,

Schedenffeldt,

Medeiros

et al. 2023

Preprint

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The presowing desiccation of Conyza spp. is an important practice to reduce weed competition with soybean, and the applications of post-emergent herbicides, as an alternative to 2,4 D, promote changes in the leaf anatomy of horseweed. The objective of the present study was to evaluate the effect of post-emergent herbicides on the leaf structure and chemical control of Conyza spp. with heights greater than 10 cm in soybean presowing desiccation. A field experiment was conducted following a randomized block design, with seven treatments and four replicates. For the control data, only mesotrione + atrazine and chlorimuron resulted in control percentages lower than 80%. Regarding scanning electron microscopy (SEM), trichomes showed higher density in the adaxial part and stomata in the abaxial part, although they were present on both sides. Both trichomes and stomata showed clustering and random distribution tendencies. The control and halauxifen + diclosulam showed greater intensity of trichomes and less damage to these structures, while fluroxypyr + clethodim, dicamba and tryclopyr showed lower intensity. Therefore, fluroxypyr + clethodim and tryclopyr, dicamba and halluxifen + diclosulam were effective in the desiccation of Conyza spp., and the first two caused disruption of the trichomes due to plasmolysis.

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Section: Discussionsupporting

confidence: 88%

“…The herbicide susceptibility of Conyza spp. is conditioned to plant height, in which case plants smaller than 10 cm are more susceptible to herbicide treatments, and plants taller than 20 cm are less susceptible to herbicide treatments 29 .…”

Section: Discussionmentioning

confidence: 99%

Changes in leaf structure and control of Conyza spp. by herbicides applied in the presowing desiccation of soybean

Silva,

Schedenffeldt,

Medeiros

et al. 2023

Preprint

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“…plants over 15 cm tall and observed 96% control five weeks after the sequential application. Silva et al (2021) also found a post-emergent effect of diclosulan on the control of Conyza spp. through synergism in association with the herbicide carfentrazone.…”

Section: Resultsmentioning

confidence: 82%

“…Other authors have already verified this increase in the control of Conyza spp. (GONÇALVES et al, 2016;ALBRECHT et al, 2019;ALBRECHT et al, 2021;SILVA et al, 2021). These results are explained by the mechanisms of action of these herbicides, saflufenacil related to the inhibition of the PROTOX enzyme and diquat to the action of photosystem I (RODRIGUES; ALMEIDA, 2018), which result in rapid and expressive control effects on Conyza spp.…”

Section: Resultsmentioning

confidence: 99%

Control of hairy fleabane in sequential and pre-emergence applications in soybean crops

Silva,

Barros,

Domingos

et al. 2023

Rev. Caatinga

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The control of Conyza spp. can be conducted at different times in the soybean crop. This study aimed to evaluate the efficiency of controlling Conyza spp. by positioning herbicides at different times and their selectivity in the soybean crop. The experiment was conducted under field conditions in a randomized block design with four replications. A first application of 2.4-D + glyphosate (975 + 1500 g of active ingredient [a.i.] ha-1) was conducted, followed by the following treatments: glufosinate (500 g i.a. ha-1), diquat (400 g a.i. ha-1), and saflufenacil + glyphosate (50 + 1500 g a.i. ha-1 ) and a third application of the pre-emergents flumioxazin + imazethapyr (60 + 127 g i. a. ha-1), sulfentrazone + diuron (210 + 420 g a.i. ha-1), diclosulam (35 g a.i. ha-1), and s-metolaclhor (1440 g a.i. ha-1), in addition to the control treatment. High percentages of control were obtained with saflufenacil + glyphosate and diquat. Glufosinate provided satisfactory control seven days after the treatment (DAT) application, with regrowth throughout the evaluations, except when diclosulam was applied. The pre-emergent herbicides reduced the emergence of Conyza spp. resulting in 0.25 plants m-2 when flumioxazin + imazethapyr was applied at 28 DAT. Regardless of the treatment, the soybean crop had no significant phytotoxicity. The management of Conyza spp. with the positioning of herbicides at different times proved to be more efficient when the sequential use of diquat and/or saflufenacil + glyphosate and flumioxazin + imazethapyr in pre-emergence was carried out.

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“…La aplicación de una secuencial con un herbicida de contacto elevó los porcentajes de control en todos los tratamientos. Resultados similares se obtuvo con trabajos realizados por Da Silva, et al (2021) con los herbicidas saflufenacil, glufosinato de amonio y diquat, fueron efectivos en el control de Conyza sp.…”

Section: Resultados Y Discusiónunclassified

Control de Conyza spp. en la región de Canindeyú con diferentes combinaciones de herbicidas

Duarte,

Villanova,

Zarza

et al. 2024

CLCS

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La soja es el cultivo agrícola más importante del Paraguay. El control de las malezas es necesario previo a la siembra, en este caso la buva (Conyza spp.), la falta de control puede reducir significativamente el rendimiento de granos. La resistencia de la buva a varios herbicidas dificulta su control. El objetivo del presente trabajo es identificar las diferentes alternativas de combinación de herbicidas para el control de la buva en pre-siembra de la soja. Se condujo el experimento en dos localidades del departamento de Canindeyú, el diseño experimental utilizado fue bloque completamente al azar con 24 tratamientos y 4 repeticiones. Fueron utilizados los herbicidas sistémicos como el glifosato, triclopyr + diclosulam, halauxifen-methyl + diclosulan, dicamba, 2,4-D y herbicidas de contactos como el saflufenacil y glufosinato de amonio. Los porcentajes de controles se realizaron a los 7, 14, 21, 28, 35 y 42, separando las plantas en alturas inferiores a 10 cm de altura y superiores, en plantas que se encontraban dentro de la parcela útil, utilizando una escala visual de 0 a 100, donde 0 corresponde a sin control y 100 a control total. La cosecha en la localidad de Katuete se realizó en la parcela útil descartando los bordes. La combinación de los herbicidas hormonales con el glifosato incrementó los porcentajes de control, la sustitución del glifosato por el glufosinato de amonio resultó con porcentajes de control superiores al 80% reduciendo la competencia con el cultivo de soja. Los tratamientos que lograron los mejores porcentajes de control fueron las que recibieron una aplicación de herbicida de contacto como secuencial.

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Estratégias de controle de Conyza spp. em pré-plantio da soja: Aplicações únicas ou sequenciais?

Cited by 6 publications

References 17 publications

Changes in leaf structure and control of Conyza spp. by herbicides applied in the presowing desiccation of soybean

Changes in leaf structure and control of Conyza spp. by herbicides applied in the presowing desiccation of soybean

Control of hairy fleabane in sequential and pre-emergence applications in soybean crops

Control de Conyza spp. en la región de Canindeyú con diferentes combinaciones de herbicidas

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