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Agronomy 2012, 2(4), 358-370; doi:10.3390/agronomy2040358
Article

Multiple Resistance of Horseweed to Glyphosate and Paraquat and Its Control with Paraquat and Metribuzin Combinations

1
, 2,* , 3
 and 4
1 Delta Research and Extension Center, Mississippi State University, 82 Stoneville Road, Stoneville, MS 38776, USA 2 Crop Production Systems Research Unit, USDA-ARS, 141 Experiment Station Road, Stoneville, MS 38776, USA 3 Pioneer Hi-Bred International—Southern Business Unit, 700 Blvd. S, SW, Suite 302, Huntsville, AL 35802, USA 4 Research and Development, Mississippi State University, Starkville, MS 39762, USA
* Author to whom correspondence should be addressed.
Received: 2 November 2012 / Revised: 23 November 2012 / Accepted: 12 December 2012 / Published: 19 December 2012
(This article belongs to the Special Issue Weed Management and Herbicide Resistance)
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Abstract

Greenhouse and field studies were conducted in 2007 and 2008 to investigate possible multiple-resistance of horseweed to paraquat and glyphosate, and to evaluate the effect of the addition of metribuzin to paraquat on control of paraquat-resistant horseweed. Results indicated that the GR50 (herbicide dose required to cause a 50% reduction in plant growth) value for the susceptible population S102 was 0.066 kg ae/ha glyphosate, and for the resistant population MDOT was 0.78 kg/ha glyphosate. The level of glyphosate resistance for MDOT was 12-fold compared with S102. The GR50 value for the susceptible population S102 was 0.078 kg ai/ha paraquat, and for the resistant population MDOT was 0.67 kg/ha paraquat. The level of paraquat resistance for MDOT was 9-fold compared to S102, suggesting multiple-resistance to glyphosate and paraquat in the MDOT population. In field studies the addition of metribuzin to paraquat improved horseweed control.
Keywords: glyphosate; herbicide resistance; metribuzin; multiple resistance; paraquat; resistance glyphosate; herbicide resistance; metribuzin; multiple resistance; paraquat; resistance
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Eubank, T.W.; Nandula, V.K.; Poston, D.H.; Shaw, D.R. Multiple Resistance of Horseweed to Glyphosate and Paraquat and Its Control with Paraquat and Metribuzin Combinations. Agronomy 2012, 2, 358-370.

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