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Glyphosate has been shown to have activity against Asian soybean rust1. Monsanto is evaluating the potential for Roundup agricultural herbicides to manage the disease. However, additional research and development is needed to determine whether glyphosate could provide sufficient levels of asian rust control as part of an Asian rust management program; then EPA approval of directions for use and product labels must be obtained.
Since Asian rust typically requires management at later stages of soybean development, Monsanto wants to emphasize that growers must not delay Roundup agricultural herbicide applications into reproductive soybean growth stages in an attempt to gain additional rust management value.
Monsanto has revised language - not made a change in use recommendations - on Roundup agricultural herbicide labels and in the Technical Use Guide to emphasize the approved application window for Roundup agricultural herbicide use with Roundup Ready Soybeans.
Current language states that Roundup agricultural herbicide applications may be made to Roundup Ready Soybeans throughout flowering. New language incorporates generally accepted soybean growth stage terminology to define "flowering" and emphasize that applications may be made through the R2 stage of growth ending when the R3 stage begins [a pod 5 millimeters (3/16 inch) long appears at one of the four uppermost nodes on the main stem with a fully developed leaf]. Applications made beyond the R2 stage of soybean growth are not labeled uses.
Monsanto will continue to fully evaluate the activity of glyphosate against Asian soybean rust and research potential commercial uses. Glyphosate is not currently registered or labeled for fungicidal use. It is a violation of federal law to use a pesticide in a manner inconsistent with labeling. Growers should consult local retailers about labeled fungicides and recommendations for Asian soybean rust control and prevention.
1. PNAS Article: Glyphosate inhibits rust diseases in glyphosate-resistant wheat and soybean. Paul C. C. Feng. G. James Baley. William P. Clinton. Greg J. Bunkers. Murtaza F. Alibhai. Timothy C. Paulitz, and Kimberlee K. Kidwell - Monsanto Biotechnology Research, St. Louis, MO 63017; Department of Crop and Soil Sciences, Washington State University, Pullman, WA 99164-6420; and Root Disease and Biological Control Research Unit, Agricultural Research Service, U.S. Department of Agriculture, Pullman, WA 99164-6430; PNAS(Proceedings of the National Academy of Sciences) 2005 102: 17290-17295; published online before print November 17 2005, 10.1073/pnas.0508873102
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