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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 (CC BY 3.0).
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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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