By WCM Staff on 4/23/2008 3:38 PM

Considering the cost of nitrogen, we can ill afford to allow weeds to use this expensive input. We conducted an experiment for the past 2 years that provided results that truly surprised us in regard to weeds and nitrogen. Basically, we confirmed that weeds are highly effective consumers of nitrogen.

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By WCM Staff on 4/23/2008 3:36 PM

Cadet is a new postemergence broadleaf herbicide for use in corn and soybeans from FMC. Authority Assist is a premix for preemergence broadleaf weed control in soybean.

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By WCM Staff on 4/23/2008 3:35 PM

A supplemental label for Callisto has been posted on CDMS that allows preemergence or postemergence applications for broadleaf weed control in oats.

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By WCM Staff on 4/17/2008 2:24 PM

A question was recently asked about restrictions of applying herbicides using nitrogen fertilizer as the carrier. Obviously, a simultaneous application can save the time and expense of separate applications. However, it would be a poor choice if there is a risk of causing crop injury, especially considering the value of the current wheat crop. Summary comments on this issue are provided in this article.

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By WCM Staff on 4/10/2008 4:22 PM

New program rules require the suppression of cool season grasses in Conservation Reserve Program (CRP) fields. The goal is to increase the diversity of cover by the interseeding of legumes.

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By WCM Staff on 4/10/2008 2:33 PM

The trend of low priced glyphosate changed in 2008. Glyphosate prices have spiked because of reduced glyphosate supplies and increased demand. Does this change how glyphosate is used in soybeans?

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By WCM Staff on 4/10/2008 2:14 PM

Sweet corn hybrid tolerance to Accent, Callisto, Impact, and Laudis was summarized in an earlier Wisconsin Crop Manager article. This article reviews updates on Accent, Option, Poast Protected hybrids, and acetochlor.

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By WCM Staff on 4/8/2008 3:30 PM

Briefly, new cases of glyphosate resistance continue to be reported.

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By WCM Staff on 4/8/2008 1:26 PM

Wisconsin has the fortunate distinction of not having any “reported” cases of glyphosate-resistant weeds (other than volunteer corn). Unfortunately, glyphosate-resistance will happen in Wisconsin. Since it’s just a question of when, our hope is to delay and limit its impact.

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By WCM Staff on 3/27/2008 2:35 PM

This season brings several new corn and soybean herbicides to the market. While some of these herbicides are marketed specifically for use in herbicide-resistant crops, others can also be used to reduce the risk of early-season weed competition. All but one of these herbicides contain active ingredients that have been previously marketed.

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By WCM Staff on 3/27/2008 2:25 PM

In addition to the wheat herbicides reviewed in the last issue, Orion (Syngenta) has recently received its registration. Orion is a postemergence broadleaf herbicide for wheat, barley and oats and contains the ingredients florasulam and MCPA.

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By WCM Staff on 3/13/2008 2:42 PM

New regulations require fields enrolled in the conservation reserve program (CRP) that are sod-bound with grasses be managed periodically to reduce this dominance and increase the diversity of desirable broadleaf plants.

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By WCM Staff on 3/13/2008 2:25 PM

Postemergence herbicides are very useful for weed management in sweet corn, but caution may be needed when certain herbicides are applied to sensitive hybrids. Over the past 3 years, we have conducted many sweet corn tolerance trials to postemergence herbicides.

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By WCM Staff on 3/13/2008 2:15 PM

Although the snow has yet to melt, it will soon and winter wheat should be off to a quick start. One nice advantage with winter wheat is weed management. Winter wheat is very competitive with weeds and many fields frequently do not need a herbicide application for weed control in Wisconsin.

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