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

Agronomy

Thomas W. Eubank²  Vijay K. Nandula³  Daniel H. Poston¹ 

[1] Pioneer Hi-Bred International—Southern Business Unit, 700 Blvd. S, SW, Suite 302, Huntsville, AL 35802, USA; E-Mail:;Delta Research and Extension Center, Mississippi State University, 82 Stoneville Road, Stoneville, MS 38776, USA; E-Mail:;Crop Production Systems Research Unit, USDA-ARS, 141 Experiment Station Road, Stoneville, MS 38776, USA

关键词: glyphosate;    herbicide resistance;    metribuzin;    multiple resistance;    paraquat;    resistance;   

DOI  :  10.3390/agronomy2040358

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2012 by the authors; licensee MDPI, Basel, Switzerland.