Susceptibility of Echinochloa populations to cyhalofop-butyl in Southern region of Brazil and impact of the weed phenology on its efficacy of control
ABSTRACT: Cyhalofop-butyl stands out among the herbicides in the control of imidazolinone-resistant Echinochloa species; but, rice farmers are not always satisfied with the control achieved with this herbicide. The objectives were to evaluate in regional scale the susceptibility of Echinochloa populations to cyhalofop-butyl, and quantify the effect of the weed phenology on its efficacy of control. For this, three trials were carried out under greenhouse conditions with a fully random design, using Echinochloa populations collected in rice fields in the southern region of Brazil. In two trials, the susceptibility level of 156 (2012/13 growth season) and 103 (2013/14 growth season) populations were evaluated with the application of cyhalofop-butyl at 360g ha-1. In other trial, in which treatments were arranged in a bi-factorial design (A = 6 x B = 5), it was evaluated six cyhalofop-butyl rates and five phenological stages of E. crus-galli populations. Echinochloa populations had showed differential susceptibility to cyhalofop-butyl, especially in the 2013/14 growth season, where 20 out of the 103 populations had control lower than 90%. The efficacy of this herbicide was inversely proportional to the phenological stage, and the application timing delay contributed directly to the decrease of susceptibility to the herbicide. Cyhalofop-butyl is an effective alternative to control imidazolinone-resistant Echinochloa populations, as long as the application timing occurs in the early phenological stages (2 to 4 leaves).
Main Authors: | Kalsing,Augusto, Tronquini,Sérgio Mateus, Mariot,Carlos Henrique Paim, Rubin,Rogerio da Silva, Bundt,Angela Da Cas, Fadin,Dauri Aparecido, Marques,Luiz Henrique |
---|---|
Format: | Digital revista |
Language: | English |
Published: |
Universidade Federal de Santa Maria
2017
|
Online Access: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000400153 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Similar Items
-
Effect of cyhalofop-butyl for annual grass weed control in rain-fed rice.
by: Esqueda-Esquivel, Valentín Alberto, et al.
Published: (2004) -
Resistencia de Echinochloa colona (L.) Link al herbicida cyhalofop-butilo en arrozales de Venezuela
by: Ortiz, Aída, et al.
Published: (2014) -
Period prior to interference of barnyardgrass is modified due to the spraying of cyhalofop-butyl alone or associated with penoxsulam in paddy rice crop
by: Agostinetto,Dirceu, et al.
Published: (2021) -
FLUAZIFOP-P-BUTYL EFFICACY AS A FUNCTION OF APPLICATION TIME AND HERBICIDE DOSE
by: CIESLIK,L.F., et al.
Published: (2017) -
Rice husk biochar influences seedling emergence of junglerice (Echinochloa colona) and herbicide efficacy
by: Chauhan, Bhagirath S.
Published: (2024-12-19T12:55:23Z)