Weeds

Controlling volunteer wheat in summer seeding alfalfa

spaced@hort.wisc.edu — Thu, 27 Aug 2009 13:15:12 GMT

Large infestations of volunteer wheat have been documented to reduce first cut alfalfa yields by 80% the following spring (Ott et al. 1989) and reduce alfalfa stands the following spring. Research was conducted at the University of Wisconsin Lancaster research station to better understand if volunteer what can reduce the density of late summer planted alfalfa the following spring and if controlling these plants in the fall will prevent these reductions in alfalfa densities the following spring.

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Harvest Aids for Winter Wheat

spaced@hort.wisc.edu — Thu, 16 Jul 2009 16:27:52 GMT

I have received a couple calls concerning options to control large weeds in winter wheat fields to aid in harvest. First, Gramoxone or paraquat is not labeled as a harvest aid in wheat or other small grains. Options for harvest aid herbicides in winter wheat include glyphosate, 2,4-D, and dicamba.

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Perennial Cucumber Watch

spaced@hort.wisc.edu — Thu, 25 Jun 2009 15:37:27 GMT

I was contacted to assist with the identification of this perennial vine (Fig. 1), which is infesting a corn field. The vines have tendrils, hairy leaves and stems, and the vines arise from tubers (Fig. 2). The UW Herbarium has tentatively identified the weed as Cucumis melo, which was domesticated as cantaloupe.

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Giant Ragweed with Suspected Glyphosate Resistance

spaced@hort.wisc.edu — Thu, 18 Jun 2009 15:52:02 GMT

Biotypes of nine weed species have been documented as glyphosate resistance in the U.S. However, glyphosate-resistant weeds have not been OFFICIALLY confirmed in Wisconsin. This article reports on a giant ragweed population that is being investigated for potential glyphosate-resistance.

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Start Scouting for Volunteer Corn

spaced@hort.wisc.edu — Thu, 11 Jun 2009 17:11:57 GMT

The increasing adoption of glyphosate-resistant corn (e.g. RR, GT) increases the potential for volunteer corn problems in soybean when glyphosate is used for weed control.

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Comfrey Questions

spaced@hort.wisc.edu — Thu, 11 Jun 2009 17:01:28 GMT

I’ve received a couple calls this summer asking for identification of a leafy green perennial with a large taproot. - Chris Boerboom, Extension Weed Scientist

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Cattail Control in Corn

spaced@hort.wisc.edu — Thu, 21 May 2009 17:48:32 GMT

Last year’s wet summer brought a new weed to many corn fields this year – cattail. Controlling this new weed will be a challenge in some cases. Obviously, cattail will establish in wet or flooded portions of fields.

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Field Horsetail ID and Management in Field Corn

spaced@hort.wisc.edu — Thu, 14 May 2009 17:50:50 GMT

Field horsetail (Equisetum arvense) is a unique, native perennial weed. The plant is unique because it grows brown fertile shoots early in the spring that produce spores, not seeds.

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Don’t Forget about Horseweed

spaced@hort.wisc.edu — Thu, 07 May 2009 14:31:09 GMT

Although this spring has been cool and some weeds are growing slower than typical, this is one winter annual weed that needs timely management and shouldn’t be ignored.

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Purple Deadnettle in No-till

spaced@hort.wisc.edu — Wed, 29 Apr 2009 17:46:41 GMT

Purple deadnettle is not a common weed for Wisconsin, but it might be one weed to be familiar with. These pictures were sent from Iowa County, where it was not controlled well with glyphosate in the past.

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Herbicides to suppress smooth brome

spaced@hort.wisc.edu — Wed, 29 Apr 2009 17:34:31 GMT

Research conducted in 2008 evaluated the effectiveness of various herbicide treatments and compared them to disked and untreated areas.A brief description of the experiments and initial results are summarized...

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Be Aware of Grapes and 2,4-D Drift

spaced@hort.wisc.edu — Thu, 23 Apr 2009 14:44:20 GMT

This is a concern in certain regions of Wisconsin because grape vineyards are either an established or expanding crop. The potential sources of 2,4-D can be from 2,4-D used in burndown applications to field crops, 2,4-D applications to pastures, or even 2,4-D applications to lawns.

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Flexstar GT labeled

spaced@hort.wisc.edu — Thu, 23 Apr 2009 14:38:19 GMT

Syngenta has registered Flexstar GT for postemergence weed control in Roundup Ready soybeans. Flexstar GT is a premix of the ingredient in Flexstar (fomesafen) and glyphosate.

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Ready to Tackle Lambsquarters?

spaced@hort.wisc.edu — Thu, 09 Apr 2009 16:23:45 GMT

The common lambsquarters season is almost here. Are you ready? It may seem odd to discuss the growing season as a lambsquarters season, but most if not all fields in Wisconsin have common lambsquarters. So, everyone will deal with lambsquarters, one way or another.

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