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Weeds
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Author: |
WCM Staff |
Created: |
4/21/2006 12:13 PM |
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Weed woes |
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Japanese hops, a new weed species to be aware of in Wisconsin |
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By WCM Staff on
8/21/2008 4:15 PM
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Last week we received two unknown weed samples for identification, one from a homeowner, the other from a field in southwest Wisconsin. The homeowner version was common hops, a native species or non-native variety of this species used for hop production for beer (Humulus lupulus). The other species in the agricultural field was Japanese hops (Humulus japonicus) a new non native invasive plant spreading in Wisconsin.
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Giant Ragweed and Nightcrawlers |
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By WCM Staff on
7/16/2008 3:11 PM
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This summary of research that has been conducted on giant ragweed and nightcrawlers explains the reason that giant ragweed is so persistent.
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Warnings on Following Pesticide Labels |
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By WCM Staff on
7/9/2008 2:14 PM
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Weather extremes can place enormous pressure on growers and applicators to use pesticides in manners that violate label directions. This year’s weather has certainly been a case in point. With the flooding in Wisconsin, many questions have been asked about the potential to replant different crops after herbicides had been applied to corn or other crops.
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Soybean Weed Management: A Mid-Season View |
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By WCM Staff on
7/2/2008 2:35 PM
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Yesterday at the UW Pest Management Field Day, the benefits of preemergence herbicides in managing early-season weed competition and herbicide application timing in soybean were clearly visible. In two field trials, we had applied an array of preemergence broadleaf herbicides, which will be followed by postemergence applications of glyphosate. The intent of these preemergence herbicides was to provide initial suppression of broadleaf weeds so that glyphosate applications could be delayed.
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Balancing Herbicide Drift vs Spray Timing |
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By WCM Staff on
6/18/2008 2:46 PM
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Three recent events trigger this article. First, a call from a landowner with significant concerns after watching a herbicide application with winds alleged at 20 mph blowing towards their berry crop. Second, yesterday’s wind that was gusting well over 20 mph and preventing herbicide applications at a time when we need to spray our trials just like many custom applicators and growers who need to spray corn fields. Third, a call asking about the risk of dew affecting glyphosate performance if spraying in early mornings to avoid the wind.
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Herbicides, Rain, and Replanting |
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By WCM Staff on
6/12/2008 1:25 PM
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The heavy rains that many fields received will raise a few key questions regarding herbicide performance and replant considerations. A major question with preemergence corn and soybean herbicides is if the heavy rains leached the herbicide out of the upper soil profile.
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Volunteer RR Corn: A New Soybean Weed? |
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By WCM Staff on
6/4/2008 3:42 PM
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While volunteer corn has been a “weed” in soybean fields ever since corn fields have been rotated to soybeans, we have not thought much about volunteer corn with Roundup Ready soybeans. Prior to significant adoption of glyphosate-resistant (e.g. Roundup Ready) corn, any volunteer corn would easily be controlled in soybeans when glyphosate was applied.
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Limits for Postemergence Corn Herbicides |
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By WCM Staff on
6/4/2008 3:31 PM
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Despite the fact that corn has struggled with this spring’s cold weather, it eventually will start growing once we get some heat. As corn and weeds start to grow more rapidly, it’s important to keep track of the right timing to apply herbicides if using a postemergence herbicide.
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Weed Quiz: Weeds in Corn |
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By WCM Staff on
5/29/2008 9:56 AM
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What is the best timing to control weeds with a herbicide in corn? Does your answer change if question #1 is changed to “What is the best timing to manage weeds in corn?”
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Prepare for Weeds in Corn |
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By WCM Staff on
5/28/2008 3:05 PM
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Successful preemergence corn herbicide programs require two key components. First, the programs need dry weather (with limited wind) in order to have the preemergence herbicides applied. Second, the programs generally need 0.5 to 1 inch of rainfall to activate the herbicide after the application, which moves the herbicide from the soil surface into the zone where weeds are germinating.
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Cleaning Herbicides from Sprayers |
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By WCM Staff on
5/21/2008 3:53 PM
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The potential for crop injury from herbicide contaminated sprayers is generally greatest with postemergence applications. Without proper clean out of sprayers, herbicide residues from one spray load can contaminate the next load and injury a sensitive crop. This is logical because the spray is making direct contact with the crops and is not being diluted with soil as with preemergence applications. Also, postemergence herbicides obviously have foliar activity, which may not be the case with all of the preemergence herbicides.
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Herbicides Kill Weeds – Why not the Crop? |
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By WCM Staff on
5/15/2008 2:25 PM
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Why is it that crops are not harmed by herbicides? The simple explanation is that some plants are able to metabolize (or detoxify) the herbicide into non-toxic chemicals before they damage the plant. However, before the discussion continues about metabolism, a quick review about herbicide mode of action is justified.
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Brush management guide updated |
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By WCM Staff on
5/7/2008 11:47 AM
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Within this guide is an overview of the various methods of management available for woody species including cultural, mechanical, and herbicidal techniques. In addition, this document summarizes information on the effectiveness of application methods with specific herbicides on common brush species of Wisconsin.
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No-See’m Weeds |
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By WCM Staff on
5/1/2008 4:25 PM
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Despite the recent snow for some, cold weather, and wet fields, weeds are still germinating and emerging. However, pressure may mount to plant corn or soybeans without controlling these weeds first.
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Don’t Fertilize Your Weeds |
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By WCM Staff on
4/23/2008 4:38 PM
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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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Print issue files for 2007
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Crop Manager Vegetable Update
Clicking on these links will access the Wisconsin Crop Manager PDF files for 2008.
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Clicking on these links will access the Wisconsin Vegetable Crop Update PDF files for 2007.
- July 31, 2008>> Veg Update 2008-11
- July 24, 2008>> Veg Update 2008-10
- July 17, 2008 >> Veg Update2008-9
- July 10, 2008 >> Veg Update2008-8
- July 3, 2008 >> Veg Update2008-7
- June 26, 2008 >> Veg Update2008-6
- June 19, 2008>> Veg Update2008-5
- June 12, 2008>> Veg Update2008-4
- June 5, 2008>> Veg Update2008-3
- May 28, 2008>> Veg Update2008-2
- May 22 2008 >> Veg Update2008-1
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- August 22 >> Veg Update2007-11
- August 9 >> Veg Update2007-10
- July 26 >> Veg Update2007-9
- July 19 >> Veg Update2007-8
- July 11 >> Veg Update2007-7
- July 5 >> Veg Update2007-6
- June 28 >> Veg Update2007-5
- June 21 >> Veg Update2007-4
- June 14 >> Veg Update2007-3
- June 6 >> Veg Update2007-2
- May 30 >> Veg Update2007-1
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