Herbicide management in glyphosate and sulfonylurea-tolerant soybeans

Silva, André Felipe Moreira; Albrecht, Alfredo Júnior Paiola; Kashivaqui, Eduardo Seity Furlan; Silva, Gustavo Soares da; Giraldeli, Ana Lígia; Araújo, Lucas da Silva; Albrecht, Leandro Paiola; Ghirardello, Giovani Apolari; Filho, Ricardo Victória

doi:10.1590/1808-1657000372019

Cited by 3 publications

(2 citation statements)

References 24 publications

(21 reference statements)

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“…However, given the subsequent increase in glyphosate (Roundup)-resistant weeds, there has been a renewed interest in SU tolerance to be "stacked" with glyphosate resistance in soybeans. Silva et al (2020a) demonstrated that when applied postemergence and in combination with glyphosate herbicide, SU herbicides (sulfometuron, chlorimuron, halosulfuron, and ethoxysulfuron) provide effective weed management in the STS cultivar BMX Garra RR2/STS and improved yield. W20 lines homozygous for the tolerant allele at the ALS1 locus were subject to a second round of mutagenesis (Walter et al, 2014).…”

Section: Core Ideasmentioning

confidence: 99%

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Genotypic effects on the response of soybean (Glycine max (L.) Merrill) to sulfonylurea herbicides

2023

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Sulfonylurea (SU) herbicides registered for use in other crops in Australia may leave residues in the soil interrupting rotations involving soybean. However, two unlinked genes (ALS1 and ALS2) confer SU tolerance in soybean. Here, we report experiments that explored the effectiveness of these ALS genes in Australian soybean germplasm. The first two experiments assessed the tolerance to halosulfuron‐methyl or metsulfuron‐methyl of lines with either zero ALS gene (ALS1) or both ALS1 and ALS2 in five different Australian genetic backgrounds. The presence of both ALS1 and ALS2 conferred strong SU tolerance at herbicide application rates as high as four times (4×) the recommended field rate, with evidence of interaction with the genetic background; lines carrying only ALS1 also performed well but demonstrated less tolerance. For the third experiment, the five lines homozygous for both ALS genes were intercrossed in a half‐diallel mating design. The resulting F2 population were screened for tolerance to metsulfuron‐methyl herbicide. In all instances, the presence of the two ALS genes provided absolute protection for the growth tip. Analyses of seedling dry weight and purple leaf discoloration demonstrated significant differences among the crosses. For dry weight, high and significant heritability estimates indicated significant additional genetic variation for SU tolerance in five of the 10 F2 crosses (p ≤ 0.05). The results of these three studies confirm that two ALS genes confer tolerance to SU herbicides when crossed into Australian soybean germplasm, but suggest possible epistatic effects within different backgrounds, and the possibility of other (minor) genes conferring additional SU tolerance.

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Section: Core Ideasmentioning

confidence: 99%

“…Silva et al. (2020a) demonstrated that when applied postemergence and in combination with glyphosate herbicide, SU herbicides (sulfometuron, chlorimuron, halosulfuron, and ethoxysulfuron) provide effective weed management in the STS cultivar BMX Garra RR2/STS and improved yield.…”

Section: Introductionmentioning

confidence: 99%

Genotypic effects on the response of soybean (Glycine max (L.) Merrill) to sulfonylurea herbicides

2023

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Efficacy of alternative herbicides to glyphosate in the weed control in glyphosate and sulfonylurea-tolerant soybean

Silva

Giraldeli²,

Silva³

et al. 2022

Acta Agron.

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It is believed that ALS inhibitor herbicides in combination with ACCase inhibitors can be used as an alternative to glyphosate in weed control in RR2/STS soybeans. In the present study, the efficacy of ALS inhibitor herbicides, in combination with haloxyfop, is evaluated in the control of weeds for post-emergence application (V4) of RR/STS soybeans. The experiment is carried out in the 2017/18 season in Piracicaba, São Paulo (SP), Brazil. The cultivar BMX Garra RR2/STS is used, and the treatments were composed by the application of ALS inhibitor herbicides in association with haloxyfop. The experimental design was a randomized block with four replications. Were evaluated control and dry mass of weeds, symptoms of injury in soybean plants and yield. The data were submitted to analysis of variance and the means of the treatments were compared by the Tukey test. Visual symptoms of injury were observed in soybean plants, mainly for the application of nicosulfuron and nicosulfuron + cloransulam. Soybean yield was higher in all herbicide treatments compared to the control without weeding. Associations between ALS inhibitor herbicides and haloxyfop applied post-emergence (V4) of soybean cultivar BMX Garra RR2/STS were effective in weed control.

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Controle de soja voluntária em áreas cultivadas com Crotalaria spectabilis

Oliveira,

Braz,

Almeida

et al. 2023

Rev. Ciênc. Agrovet.

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Tem sido comum a presença de plantas voluntárias de soja em lavouras de crotalária (Crotalaria spectabilis) cultivada em segunda safra, necessitando assim a adoção de estratégias para o seu manejo. Este trabalho teve como objetivo avaliar a eficácia e a seletividade dos herbicidas pyrithiobac-sodium e ethoxysulfuron aplicados isoladamente em pós-emergência da crotalária visando ao controle de soja voluntária. Para tanto, foram instalados dois experimentos a campo, um avaliando a viabilidade de uso do herbicida pyrithiobac-sodium e outro do ethoxysulfuron. Em ambos os experimentos foi utilizado o delineamento de blocos casualizados, estando os tratamentos dispostos em esquema fatorial 2x4+2, com quatro repetições. No primeiro fator alocou-se à aplicação em pós-emergência dos herbicidas em dois estádios fenológicos distintos V3 e 3 folhas verdadeiras e V7 e 6 folhas verdadeiras, respectivamente para a soja e a crotalária. No segundo fator foi disposto doses crescentes dos herbicidas, sendo utilizadas as doses 14,0; 22,4; 30,8; e 39,2 g ha-1 para pyrithiobac-sodium e 18,0; 30,0; 42,0; e 54,0 g ha-1 para ethoxysulfuron. Os tratamentos adicionais corresponderam a uma testemunha infestada e outra capinada. Foram realizadas avaliações de controle visual da soja voluntária, bem como da fitointoxicação, estande, altura e massa seca de parte aérea das plantas de crotalária. De acordo com os resultados obtidos, o pyrithiobac-sodium na dose de 30,8 g ha-1, pode ser recomendado para aplicações quando as plantas de soja voluntária estiverem em V3 e as plantas de crotalária com 3 folhas verdadeiras, bem como o herbicida ethoxysulfuron na dose 18 g ha-1, pode ser recomendado para aplicações quando as plantas de soja voluntária estiverem em V3 ou V7 e as plantas de crotalária com três folhas verdadeiras. Esses dois herbicidas nas respectivas doses apresentam potencial para serem registrados para uso em áreas de cultivo de crotalária em sucessão à cultura da soja.

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Herbicide management in glyphosate and sulfonylurea-tolerant soybeans

Cited by 3 publications

References 24 publications

Genotypic effects on the response of soybean (Glycine max (L.) Merrill) to sulfonylurea herbicides

Genotypic effects on the response of soybean (Glycine max (L.) Merrill) to sulfonylurea herbicides

Efficacy of alternative herbicides to glyphosate in the weed control in glyphosate and sulfonylurea-tolerant soybean

Controle de soja voluntária em áreas cultivadas com Crotalaria spectabilis

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