Submitted to: Review Article
Publication Type: Review Article
Publication Acceptance Date: 6/7/2005
Publication Date: 8/15/2005
Citation: Nandula, V.K., Reddy, K.N., Duke, S.O., Poston, D.H. 2005. Glyphosate-resistant weeds: current status and future outlook. Outlooks on Pest Management, August 2005, pp. 183-187.. Interpretive Summary:
Technical Abstract: Introduction of glyphosate-resistant transgenic crops has revolutionized weed management. GR crops as weed management tools have allowed farmers to manage weeds more effectively and economically. High levels of adoption of GR crops by U.S. farmers have dramatically increased the use of glyphosate, with a concomitant decrease in use of other herbicides. This has impacted weed communities. Evolution of weeds resistant to glyphosate and weed species shifts towards naturally resistant species in GR crops require alternative strategies to manage weeds. GR crops should not be relied solely on their respective herbicides to the exclusion of other weed control methods, and should be used within integrated management systems. The problem of GR weeds is real, and farmers have to understand that continuous use of glyphosate without alternative strategies will likely result in evolution of more GR weeds. Even in the short term, no one can predict the future loss of glyphosate efficacy due to weed species shifts and evolution of glyphosate resistance. This will depend on whether mitigation strategies will be adopted by farmers and the inherent predisposition of many different weed species to evolve resistance or to move into agricultural ecosystems.