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Efficacy of pre-emergence herbicides in controlling Sumatran fleabane (Conyza sumatrensis) in the off-season

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dc.contributor.authorGarcia, F.C.
dc.contributor.authorAlbrecht, A.J.P.
dc.contributor.authorAlbrecht, L.P.
dc.contributor.authorBarbosa, J.R.
dc.contributor.authorSilva, A.F.M.
dc.contributor.authorLarini, W.F.
dc.contributor.authorMoreno, G.
dc.contributor.authorBarroso, A.A.M.
dc.date.accessioned2023-05-23T07:02:21Z
dc.date.available2023-05-23T07:02:21Z
dc.date.issued2023
dc.descriptionReceived: February 1st, 2023 ; Accepted: May 7th, 2023 ; Published: May 19th, 2023 ; Correspondence: afmoreirasilva@alumni.usp.breng
dc.description.abstractPre-emergence herbicides can be effective in controlling Sumatran fleabane (Conyza sumatrensis [Retz.] E.Walker) at soybean and other crops. The goal was to evaluate the effectiveness of sulfentrazone/diuron, imazethapyr/flumioxazin, flumioxazin, diclosulam, s-metolachlor, imazethapyr, clomazone and imazapic/imazapyr in controlling Sumatran fleabane for application in the off-season before soybean planting. Three experiments were conducted in the off season, with 9 treatments. The control of Sumatran fleabane was evaluated at 28, 42 and 49 days after application (DAA), at 49 DAA was performed counting of plants per m2 . In experiment 1, the worst performance was found for s-metolachlor (58.3% final control), in a situation of lower emergence flow of Sumatran fleabane, with equivalence for the other herbicides. In experiments 2 and 3, with greater emergence flow of Sumatran fleabane, clomazone efficacy stood out (≥ 86.3% final control). A micro-encapsulated formulation of clomazone was used, which causes greater intoxication to this weed due to its slow release into the soil, and presents less loss to the environment. In conditions of lower emergence of Sumatran fleabane, sulfentrazone/diuron, imazethapyr/flumioxazin, flumioxazin, diclosulam, imazethapyr, clomazone and imazapic/imazapyr were effective in controlling it. Even in this condition, s-metolachlor was not effective in controlling Sumatran fleabane. The application of clomazone was effective in controlling Sumatran fleabane in the three experiments. Clomazone is characterized as an important herbicide for use in the off season in the management of this weed before soybean sowing.eng
dc.identifier.issn2228-4907
dc.identifier.publicationAgronomy Research, 2023, vol. 21, no. 3, pp. 1119–1127eng
dc.identifier.urihttp://hdl.handle.net/10492/8241
dc.identifier.urihttps://doi.org/10.15159/ar.23.042
dc.publisherEstonian University of Life Scienceseng
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)eng
dc.rightsinfo:eu-repo/semantics/openAccesseng
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectclomazoneeng
dc.subjectearly managementeng
dc.subjectErigeron sumatrensislat
dc.subjectweedeng
dc.subjectweed emergenceeng
dc.subjectarticleseng
dc.titleEfficacy of pre-emergence herbicides in controlling Sumatran fleabane (Conyza sumatrensis) in the off-seasoneng
dc.typeinfo:eu-repo/semantics/articleeng

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2023, Vol. 21, No. 3