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By: Ben Stoller- Mercer Landmark agronomist

The Marestail Menace

With glyphosate resistant marestail becoming an unfortunate reality soybean fields in parts of the Midwest, growers should be aware of its presence and methods of control.

Marestail is an annual-like many other weeds-but can be both a summer or winter annual; therefore, a fall and spring approach may be necessary to realize complete control.  Research indicates mature Marestail plants can produce over 200,000 seeds, with fall emerged plants producing more than spring emerging plants.  Additionally, the U of I indicates fall applied herbicides provide better control of emerged Marestail than spring ‘burndown’ applications.

Dr. Mark Loux with OSU Weed Science and Dr. Bill Johnson with Purdue University Extension Weed Science have co-written an article with recommendations for both fall and spring control.

Fall:

Both scientists recommend a fall application of 2, 4-D as a base herbicide and combining with one of: glyphosate; dicamba (premixes of dicamba and 2, 4-D, such as Brash®), or a lower rate of a residual.  University of Illinois scientists emphasize a sole application of glyphosate on emerged Marestail should not be used, either in autumn or spring.

Spring:

Perhaps most important is remember to save the majority of the residual application for spring (for the most full season control), and to include the residual with the burndown treatment.  U of I researchers also maintain that growers can expect to treat in both seasons for best control.

The links below provide details on Marestail biology, characteristics and management:

http://agcrops.osu.edu/specialists/weeds/marestail/marestailfact09_000.pdf

http://bulletin.ipm.illinois.edu/?p=1749

Please contact your local Mercer Landmark Agronomy Sales Representative for assistance.


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