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Liberty & Roundup Resistant Soybean
Liberty (glufosinate) at 28 to 34 fl oz/A applied POST to Liberty tolerant soybean
varieties
controls most annual grass and broadleaf weeds and provides suppression of some perennial
weeds. Apply Liberty EPOST/POST to Liberty tolerant soybean varieties prior to flowering.
Liberty is a nonselective, nonresidual, contact type herbicide with limited translocation.
Liberty
should be applied to small weeds because of limited translocation. Lack of translocation
may result in poor control of grasses that produce tillers or are large at the time of
application. Grasses like yellow foxtail, wild oat, and volunteer cereals that produce
many tillers may not be controlled with one application. Liberty is nonresidual so
multiple applications or applying with a residual herbicide may be needed to control
multiple weed flushes. Lack of soil residue will allow any crop to be planted the
following year. Liberty does not require addition of an adjuvant. However, Liberty should
always be applied with spray grade AMS fertilizer. Refer to label for weeds controlled,
application information, timing, tank-mix options, and other restrictions.
Liberty has a unique mode of action which is different from Roundup and all other
herbicides
currently registered. Liberty will control all currently resistant weeds and will add
another mode of action to prevent other weeds from developing resistance to other
herbicides. Refer to Liberty
paragraph in the herbicide tolerant corn section of the Weed Control Guide for additional information.
ROUNDUP (Glyphosate) RESISTANT SOYBEAN
Glyphosate at 1 to 2 pt/A of a 3 lb ae/gal concentrate or 1.2 to 3.2 lb ae/gal concentrate
applied only to glyphosate resistant soybean will control most annual and perennial weeds.
Refer to label for adjuvant use. Application timing may not
be appropriate for effective perennial weed control. Glyphosate is a nonselective,
nonresidual, systemic herbicide that can control grasses at rates as low as 0.25 pt/A.
Labeled rates are required for broadleaf weeds. However, some broadleaf weeds like kochia,
nightshade, wild buckwheat, horseweed (marestail), dandelion, and lambsquarters may not be
adequately controlled by one application of glyphosate. Refer to label for weeds
controlled, application information, timing, tank-mix options, and other restrictions.
Lack of residue from Roundup
Ultra alone will allow any crop to be planted the following year. Roundup has a unique
mode of action which is different from Liberty and all other herbicides currently
registered. Roundup will control weeds resistant to other herbicides and will add another
mode of action to help prevent development of resistant weeds. However, effective weed
control from Roundup Ultra may cause a heavy selection pressure to any weed with slight
tolerance, like those listed earlier.
Revised June 1, 2004
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