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Hairy fleabane (Conyza bonarienis) response to saflufenacil in association with different formulations of glyphosate subjected to simulated rainfall

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dc.contributor.authorDalazen, G.
dc.contributor.authorPisoni, A.
dc.contributor.authorMenegaz, C.
dc.contributor.authorMerotto Jr., A.
dc.date.accessioned2020-04-19T14:34:56Z
dc.date.available2020-04-19T14:34:56Z
dc.date.issued2020
dc.description.abstractSaflufenacil has been used to control glyphosate resistant weeds, including hairy fleabane. There are several glyphosate formulations, which are related to different salts and adjuvants. Differences between these formulations may result in variations in efficacy, especially in the face of unfavorable environmental conditions, such as the occurrence of unexpected rainfall after application. The objective of this study was to evaluate the control of hairy fleabane with saflufenacil in tank mix with different formulations of glyphosate subjected to simulated rainfall after application. The treatments evaluated were salts of glyphosate (isopropylamine, potassium and ammonium salt), different periods of simulated rainfall after herbicide application (30, 120 and 240 min, and no rainfall), and the presence or absence of saflufenacil and a non-ionic adjuvant. Absorption of saflufenacil by hairy fleabane is rapid, since simulated rainfall after 30 min after application did not result in loss of efficiency when the herbicide is applied with adjuvant. The association of isopropylamine and ammonium salts of glyphosate with saflufenacil increases the control of hairy fleabane and prevents the occurrence of regrowth when rainfall occurs at 30 min after the application. The occurrence of simulated rainfall after 240 min reduces the glyphosate efficiency by 30%, 15% and 60% for the isopropylamine, potassium and ammonium salt formulations, respectively. The addition of adjuvant improves the efficiency of glyphosate salt of potassium by 40%. The response of the mixture of glyphosate and saflufenacil is variable, mainly in situations of rainfall after application.eng
dc.identifier.issn1406-894X
dc.identifier.publicationAgronomy Research, 2020, vol. 18, no. 1, pp. 63–76eng
dc.identifier.urihttp://hdl.handle.net/10492/5622
dc.identifier.urihttps://doi.org/10.15159/ar.20.033
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) ; openAccess
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectEPSPSeng
dc.subjectherbicide absorptioneng
dc.subjectPPOeng
dc.subjecttank mixeng
dc.subjectweed resistanceeng
dc.subjectarticleseng
dc.titleHairy fleabane (Conyza bonarienis) response to saflufenacil in association with different formulations of glyphosate subjected to simulated rainfalleng
dc.typeArticleeng

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2020, Vol. 18, No. 1