Linuron Biologically Effective Dose for Glyphosate-Resistant Giant Ragweed (Ambrosia trifida L.) Control in Soybean (Glycine max L.)

Kimberly D. Walsh, Nader Soltani, Lynette R. Brown, Peter H. Sikkema

University of Guelph Ridgetown Campus, Ridgetown, Canada.

DOI: 10.4236/ajps.2014.518285                

Abstract

Glyphosate-resistant (GR) giant ragweed (Ambrosia trifida L.) was first identified in Canada in 2008 and has since been found throughout southwestern Ontario. Six field trials were conducted over a two-year period (2012, 2013) on Ontario farms with GR giant ragweed to evaluate the efficacy of linuron applied pre-plant (PP) in soybean (Glycine max (L.) Merr.). The dose required for 50%, 80%, and 95% GR giant ragweed control was 1238, 2959, and 6018 g·ai·ha^-1 four weeks after application (WAA), respectively. The linuron dose needed for 50%, 80%, and 95% reduction in density was 1554, 3181, and 5643 g·ai·ha^-1 and 1204, 2496, and 4452 g·ai·ha^-1 for dry weight, respectively. Application of 7874 g·ai·ha^-1 linuron was needed to obtain soybean yields that were 90% of the weed-free control; approximately 3.5 times the maximum field recommended dose. To achieve 95% and 98% yields, greater than 8640 g·ai·ha^-1 linuron was required. Application of linuron plus glyphosate PP in soybean will help to control GR giant ragweed as well as reduce GR selection pressure.

Keywords

Giant Ragweed, Glyphosate-Resistant, Linuron, Soybean

Conflicts of Interest

The authors declare no conflicts of interest.

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