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Glyphosate has been shown to have activity against Asian soybean rust.
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.
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