000			02720nab a2200301 i 4500
003			BR-BrBNA
005			20230925132946.0
008			230814b2020 bl.ar|pooa||| 00| 0 eng |
040			_aBR-BrBNA _beng
072			_aH60
100			_aPresoto, J.C.
100			_aAndrade, J.F.
100			_aSouza, L.A.
100			_aTeixeira, L.S.
100			_aCarvalho, S.J.P.
245			_aSourgrass phenological stage and efficacy of ACCase-inhibiting herbicides
500			_aPublicação on-line; 25 ref.; 3 tables; 2 illus.; Summary (En)
520			_a ABSTRACT Background: Sourgrass (Digitaria insularis) is a highly disseminated weed in Brazil. It is a perennial grass weed that has high infesting capacity in agricultural areas and presents glyphosate-resistant biotypes. An effective post-emergence control of sourgrass plants depends on their phenological stage at the time of herbicide application. Objective: This work was developed with the objective of evaluating the effect of the sourgrass phenological stage at the time of herbicide application on the efficacy of ACCase-inhibiting herbicides. Methods: Two independent experiments were conducted under greenhouse conditions to evaluate two ACCase-inhibiting herbicides: clethodim, and haloxyfop. The treatments were applied using a completely randomized block design, with an 8×4 factorial arrangement consisted of 8 herbicide rates (4, 2, 1, 1/2, 1/4, 1/8, and 1/16 times the recommended rate, and a control plot without herbicide application) and four phenological stages of sourgrass. Results: The development of sourgrass plants after tillering decreased the efficacy of the herbicide molecules; however, clethodim and haloxyfop were efficient to control sourgrass at earlier developmental stages. Morphological, anatomical, and physiological changes in older plants may explain the lower susceptibility to herbicides. Conclusions: Other control techniques should be considered for sourgrass plants at later developmental stages, such as sequential application or herbicide mixtures, to increase the efficacy of ACCase herbicides. Keywords: Digitaria insularis clethodim haloxyfop management resistance
650			_aDIGITARIA
650			_aHERBICIDA
650			_aGESTÃO
650			_aFENOLOGIA
650			_aRESISTÊNCIA A PRODUTOS QUÍMICOS
773	0		_0886 _91817 _dLondrina-PR : Sociedade Brasileira da Ciência das Plantas Daninhas, 1978 _o2023-031024 _tPlanta Daninha (Brazil) _x0100-8358; 1806-9681 (on-line) _gv. 38 p. 1-7; (2020) _wBR2023000859
856			_uhttps://www.scielo.br/j/pd/a/ZT5JPYrKgcGbKxJPSr37NSk/?format=pdf&lang=en
942			_cAnalítica
999			_c9808 _d9808