By WCM Staff on 4/25/2007 12:14 PM

Horseweed (or marestail) is the most widely distributed glyphosate-resistant weed in the U.S. After the initial confirmation in Delaware in 2001, glyphosate-resistant (GR) horseweed has been reported 15 states, including Illinois to our south and Nebraska to our southwest. The potential for horseweed seed to move from one farm to another or even from one county to another is an interesting question.

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By WCM Staff on 4/19/2007 1:04 PM

Whether glyphosate is being applied in burndown applications at this time of the season or in the middle of summer, applications need to be managed to avoid drift to sensitive crops or adjacent properties.

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By WCM Staff on 4/19/2007 12:58 PM

Winter wheat might be smaller than normal at this time of the year, which means the wheat might be more susceptible to weed competition. The two herbicides that generally have the greatest risk of injuring winter wheat are 2,4-D and dicamba...

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By WCM Staff on 4/19/2007 11:40 AM

This tool used data collected from the weed garden at Arlington to develop easy to read graphs that show the range of first emergence, the typical first emergence, and range of flowering times of 69 common weed species found in Wisconsin.

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By WCM Staff on 4/11/2007 11:58 AM

Label updates on the herbicides Breakfree, Caonopy EX, and Express

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By WCM Staff on 4/11/2007 11:49 AM

In impromptu no-till fields, growers are unprepared for effective weed management. Effective weed management in no-till includes 1) managing winter annuals (mustards, horseweed, prickly lettuce, etc.) and perennials like dandelions before planting; 2) burning down early emerging summer annuals like giant ragweed, foxtails, and lambsquarters; and 3) managing early season weed competition.

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By WCM Staff on 4/4/2007 1:51 PM

The Poast label from MicroFlo and the Poast Plus label from BASF are the two labels that include use directions for sethoxydim-resistant sweet corn hybrids. The addition of sethoxydim-resistant sweet corn is new on the BASF Poast Plus label for this year.

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By WCM Staff on 4/4/2007 12:49 PM

SureStart is a new premix being launched by Dow AgroSciences for early season weed control in field corn in programs where the application will be followed with a postemergence application of glyphosate or Liberty.

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By WCM Staff on 3/8/2007 9:53 AM

I was recently asked if I had a list of generic or post-patent corn and soybean herbicides. Although I don’t have a list, I would recommend the Department of Agriculture, Trade, and Consumer Protection web site of “Pesticide Database Searches” at http://www.kellysolutions.com/wi/.

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By WCM Staff on 3/8/2007 9:49 AM

Valor XLT is a premix of Valor (30% flumioxazin) and Classic (10.3% chlorimuron) by Valent which is labeled for broadleaf weed control and suppression of annual grasses. The main label does not include mention of use in Wisconsin, but a supplement label is available from Valent (not on CDMS) that allows use of the lowest labeled rate of 2.5 oz/a in southern Wisconsin. Applications can only be made south of I-90 between LaCrosse and Madison and south of I-94 between Madison and Milwaukee.

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By WCM Staff on 3/8/2007 9:43 AM

While continuous corn may affect insect and disease management, I believe the effect on weed management will be relatively minor. Because corn is not a “host” of weeds like corn is a host of disease or insects, corn will not cause specific weed species to increase just because it is planted. Rather, weeds may increase because other practices used in corn production allow weed shifts or increased weed populations.

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By WCM Staff on 2/15/2007 11:12 AM

To help producers understand the potential costs and benefits of this new technology Dan Undersander has created a calculator that can help you estimate the differences in costs between RR alfalfa and standard alfalfa varieties. It is currently available at the following URL: http://www.uwex.edu/ces/forage/pubs/economics_RR_alfalfa.xls

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By WCM Staff on 1/18/2007 12:58 PM

Pesticide updates for corn and soybean. Corn - Autumn (Bayer) and Status (BASF). Soybean - Canopy (DuPont) , Authority First DF (FMC), and Sonic (Dow), and Prefix CP (Syngenta)

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By WCM Staff on 1/18/2007 12:36 PM

Extension weed scientists at Ohio State University and Purdue University have recently reported confirmed cases of glyphosate-resistant giant ragweed in Ohio and Indiana. This will certainly be important to the growers who have this problem, especially in years when they are growing soybeans in these fields. This should be a warning notice to Wisconsin soybean growers as the complaints about giant ragweed continue to increase in Wisconsin.

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