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United States Department of Agriculture

Agricultural Research Service

Research Project: INTEGRATED WEED MANAGEMENT SYSTEMS FOR ORGANIC AND CONVENTIONAL CROPS OF THE SOUTHEASTERN COASTAL PLAIN

Location: Crop Protection and Management Research

Title: Interaction of flumioxazin with dimethenamid or metolachlor in peanut (Arachis hypogaea L.)

Authors
item Grichar, W -
item Besler, B -
item Dotray, P -
item Johnson, Wiley
item Prostko, E -

Submitted to: Peanut Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: October 24, 2003
Publication Date: May 6, 2004
Citation: Grichar, W.J., Besler, B.A., Dotray, P.A., Johnson, W.C., Prostko, E.P. 2004. Interaction of flumioxazin with dimethenamid or metolachlor in peanut (Arachis hypogaea L.). Peanut Science. 31:12-16.

Interpretive Summary: Flumioxazin improves broadleaf weed control in peanut, particularly when combined with other residual herbicides. However, there is little information on the injury potential of flumioxazin when combined with these herbicides. Field studies were conducted in various peanut growing regions of Texas and Georgia to study peanut response to flumioxazin alone or in combination with dimethenamid or metolachlor. In southern Texas during 1997, flumioxazin plus metolachlor resulted in greater than 45% peanut stunt, while flumioxazin plus dimethenamid caused less than 20% peanut stunt. This stunting was attributed to cool, wet growing conditions. Peanut yields in flumioxazin plus metolachlor-treated plots were reduced 58% compared to peanut in the non-treated control. In 1999 and 2000, flumioxazin plus dimethenamid or metolachlor resulted in 15% or greater peanut stunt, but stunting was not constant across weather conditions or locations. In west Texas and Georgia no peanut stunting with flumioxazin was noted. At the Levelland, TX location, flumioxazin at 0.07 kg/ha plus metolachlor at 1.1 kg/ha reduced peanut yield 32% compared with the non-treated control; while at the Pearsall, TX location, metolachlor or dimethenamid at 1.1 kg/ha, flumioxazin at 0.07 kg/ha plus dimethenamid at 1.5 kg/ha, and flumioxazin at 0.1 kg/ha plus dimethenamid at 1.1 kg/ha reduced peanut yield 24 to 48% when compared with the non-treated check. No yield reduction was noted in Georgia. These data suggest that under normal planting-season conditions, flumioxazin plus either metolachlor or dimethenamid are not over injurious to peanut and not risky to use. If unusually cool conditions are prevalent at planting time, these herbicides should not be used in combination.

Technical Abstract: Field studies were conducted in various peanut growing regions of Texas and Georgia to study peanut response to flumioxazin alone or in combination with dimethenamid or metolachlor. In southern Texas during 1997, flumioxazin plus metolachlor resulted in greater than 45% peanut stunt, while flumioxazin plus dimethenamid caused less than 20% peanut stunt. This stunting was attributed to cool, wet growing conditions. Peanut yields in flumioxazin plus metolachlor-treated plots were reduced 58% compared to peanut in the non-treated control. In 1999 and 2000, flumioxazin plus dimethenamid or metolachlor resulted in 15% or greater peanut stunt, but stunting was not constant across weather conditions or locations. In west Texas and Georgia no peanut stunting with flumioxazin was noted. At the Levelland, TX location, flumioxazin at 0.07 kg/ha plus metolachlor at 1.1 kg/ha reduced peanut yield 32% compared with the non-treated control; while at the Pearsall, TX location, metolachlor or dimethenamid at 1.1 kg/ha, flumioxazin at 0.07 kg/ha plus dimethenamid at 1.5 kg/ha, and flumioxazin at 0.1 kg/ha plus dimethenamid at 1.1 kg/ha reduced peanut yield 24 to 48% when compared with the non-treated check. No yield reduction was noted in Georgia.

Last Modified: 9/2/2014