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1 September 2013 Optimization of Application Efficacy for POST Herbicides with Adjuvants on Three-Cornered Jack (Emex australis Steinheil) in Wheat
Muhammad Mansoor Javaid, Asif Tanveer
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Abstract

Field studies were conducted to evaluate POST herbicides with adjuvants for the control of three-cornered jack in winter wheat. The herbicides evaluated were fluroxypyr 9.7% w/w MCPA 38.8% w/w (formulated mixture [450 g ai ha−1]), carfentrazone-ethyl (20 g ai ha−1), bromoxynil 26.8% w/w MCPA 40.0% w/w (formulated mixture [450 g ai ha−1]), thifensulfuron-methyl (75 g ai ha−1), and tribenuron-methyl (75 g ai ha−1), applied alone or tank mixed with the adjuvants alkyl ether sulfate sodium salt (625 mL ha−1) or fatty alcohol ethoxylate (375 mL ha−1). The addition of adjuvants to carfentrazone-ethyl resulted in > 94% control of three-cornered jack. Both adjuvants enhanced the efficacy of all herbicides for control of three-cornered jack, except thifensulfuron-methyl. However, a maximum increase in phytotoxicity on three-cornered jack was achieved with the addition of either adjuvant to tribenuron-methyl compared with herbicides used alone. Bromoxynil MCPA and carfentrazone-ethyl gave maximum wheat yield and yield components.

Nomenclature: Fluroxypyr MCPA; carfentrazone-ethyl; bromoxynil MCPA; thifensulfuron-methyl; tribenuron-methyl; three-cornered jack, Emex australis Steinheil; wheat, Triticum aestivum L.

Se realizaron estudios de campo para evaluar herbicidas POST con adyuvantes para el control de Emex australis en trigo de invierno. Los herbicidas evaluados fueron fluroxypyr 9.7% w/w MCPA 38.8% w/w (mezcla en formulación [450 g ai ha−1]), carfentrazone-ethyl (20 g ai ha−1), bromoxynil 26.8% w/w MCPA 40.0% w/w (mezcla en formulación [450 g ai ha−1]), thifensulfuron-methyl (75 g ai ha−1), y tribenuron-methyl (75 g ai ha−1), aplicados solos o en mezcla en tanque con los adyuvantes sal de alkyl ether sulfate sodium (625 mL ha−1) o alcohol graso ethoxylate (375 mL ha−1). La adición de adyuvantes a carfentrazone-ethyl resultó en >94% de control de E. australis. Ambos adyuvantes mejoraron la eficacia de todos los herbicidas para el control de E. australis, excepto thifensulfuron-methyl. Sin embargo, un incremento máximo de fitotoxicidad en E. australis se alcanzó con la adición de cualquiera de los adyuvantes a tribenuron-methyl al compararse con los herbicidas usados solos. Bromoxynil MCPA y carfentrazone-ethyl brindaron el mayor rendimiento y componentes de rendimiento del trigo.

Muhammad Mansoor Javaid and Asif Tanveer "Optimization of Application Efficacy for POST Herbicides with Adjuvants on Three-Cornered Jack (Emex australis Steinheil) in Wheat," Weed Technology 27(3), 437-444, (1 September 2013). https://doi.org/10.1614/WT-D-11-00130.1
Received: 18 September 2011; Accepted: 1 February 2013; Published: 1 September 2013
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