CONTROL OF GLYPHOSATE RESISTANT HAIRY FLEABANE (Conyza bonariensis) WITH DICAMBA AND 2,4-D
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
30/10/2013
30/10/2013
02/08/2013
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Resumo |
Auxyn type herbicides such as dicamba and 2,4-D are alternative herbicides that can be used to control glyphosate-resistant hairy fleabane. With the forthcoming possibility of releasing dicamba-resistant and 2,4-D-resistant crops, use of these growth regulator herbicides will likely be an alternative that can be applied to the control of glyphosate resistant hairy fleabane (Conyza bonariensis). The objective of this research was to model the efficacy, through dose-response curves, of glyphosate, 2,4-D, isolated dicamba and glyphosate-dicamba combinations to control a brazilian hairy fleabane population resistant to glyphosate. The greenhouse dose-response studies were conducted as a completely randomized experimental design, and the rates used for dose response curve construction were 0, 120, 240, 480, 720 and 960 ga.i. ha(-1) for 2,4-D, dicamba and the dicamba combination, with glyphosate at 540 g a. e. ha(-1). The rates for glyphosate alone were 0, 180, 360, 540, 720 and 960 g a. e. ha(-1). Herbicides were applied when the plants were in a vegetative stage with 10 to 12 leaves and height between 12 and 15 cm. Hairy fleabane had low sensitivity to glyphosate, with poor control even at the 960 g a. e. ha(-1) rate. Dicamba and 2,4-D were effective in controlling the studied hairy fleabane. Hairy fleabane responds differently to 2,4-D and dicamba. The combination of glyphosate and dicamba was not antagonistic to hairy fleabane control, and glyphosate may cause an additive effect on the control, despite the population resistance. |
Identificador |
PLANTA DANINHA, VICOSA, v. 30, n. 2, supl. 2, Part 2, pp. 401-406, APR-JUN, 2012 0100-8358 http://www.producao.usp.br/handle/BDPI/36912 10.1590/S0100-83582012000200020 |
Idioma(s) |
eng |
Publicador |
UNIV FEDERAL VICOSA VICOSA |
Relação |
PLANTA DANINHA |
Direitos |
openAccess Copyright UNIV FEDERAL VICOSA |
Palavras-Chave | #CONYZA BONARIENSIS #DOSE-RESPONSE #GLYPHOSATE-RESISTANT HAIRY FLEABANE #WEED RESISTANCE #HERBICIDES #CANADENSIS #BIOTYPES #SORGHUM #PLANT SCIENCES |
Tipo |
article original article publishedVersion |