Weed woes http://ipcm.wisc.edu/WCMNews/tabid/53/BlogId/20/Default.aspx en-US spaced@hort.wisc.edu webadmin@hort.wisc.edu Tue, 18 Nov 2008 11:07:07 GMT Tue, 18 Nov 2008 11:07:07 GMT http://backend.userland.com/rss Blog RSS Generator Version 3.2.0.29758 The database contains 280 of the most common weeds/invasive plants found in agricultural, urban, and natural settings in Wisconsin. The database can be accessed (for free) by going to the website http://weedid.wisc.edu http://ipcm.wisc.edu/WCMNews/tabid/53/EntryID/644/Default.aspx spaced@hort.wisc.edu http://ipcm.wisc.edu/Default.aspx?tabid=53&EntryID=644 Thu, 09 Oct 2008 18:54:00 GMT http://ipcm.wisc.edu/DesktopModules/Blog/Trackback.aspx?id=644 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. http://ipcm.wisc.edu/WCMNews/tabid/53/EntryID/623/Default.aspx spaced@hort.wisc.edu http://ipcm.wisc.edu/Default.aspx?tabid=53&EntryID=623 Thu, 21 Aug 2008 21:15:00 GMT http://ipcm.wisc.edu/DesktopModules/Blog/Trackback.aspx?id=623 The Wisconsin Department of Natural Resources is developing rules to address invasive species in Wisconsin, including invasive terrestrial and aquatic plants. The proposed rules will establish a classification and regulatory system for invasive species. http://ipcm.wisc.edu/WCMNews/tabid/53/EntryID/604/Default.aspx spaced@hort.wisc.edu http://ipcm.wisc.edu/Default.aspx?tabid=53&EntryID=604 Thu, 24 Jul 2008 18:27:00 GMT http://ipcm.wisc.edu/DesktopModules/Blog/Trackback.aspx?id=604 This summary of research that has been conducted on giant ragweed and nightcrawlers explains the reason that giant ragweed is so persistent. http://ipcm.wisc.edu/WCMNews/tabid/53/EntryID/596/Default.aspx spaced@hort.wisc.edu http://ipcm.wisc.edu/Default.aspx?tabid=53&EntryID=596 Wed, 16 Jul 2008 20:11:00 GMT http://ipcm.wisc.edu/DesktopModules/Blog/Trackback.aspx?id=596 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. http://ipcm.wisc.edu/WCMNews/tabid/53/EntryID/592/Default.aspx spaced@hort.wisc.edu http://ipcm.wisc.edu/Default.aspx?tabid=53&EntryID=592 Wed, 09 Jul 2008 19:14:00 GMT http://ipcm.wisc.edu/DesktopModules/Blog/Trackback.aspx?id=592 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. http://ipcm.wisc.edu/WCMNews/tabid/53/EntryID/587/Default.aspx spaced@hort.wisc.edu http://ipcm.wisc.edu/Default.aspx?tabid=53&EntryID=587 Wed, 02 Jul 2008 19:35:00 GMT http://ipcm.wisc.edu/DesktopModules/Blog/Trackback.aspx?id=587 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. http://ipcm.wisc.edu/WCMNews/tabid/53/EntryID/568/Default.aspx spaced@hort.wisc.edu http://ipcm.wisc.edu/Default.aspx?tabid=53&EntryID=568 Wed, 18 Jun 2008 19:46:00 GMT http://ipcm.wisc.edu/DesktopModules/Blog/Trackback.aspx?id=568 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. http://ipcm.wisc.edu/WCMNews/tabid/53/EntryID/563/Default.aspx spaced@hort.wisc.edu http://ipcm.wisc.edu/Default.aspx?tabid=53&EntryID=563 Thu, 12 Jun 2008 18:25:00 GMT http://ipcm.wisc.edu/DesktopModules/Blog/Trackback.aspx?id=563 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. http://ipcm.wisc.edu/WCMNews/tabid/53/EntryID/545/Default.aspx spaced@hort.wisc.edu http://ipcm.wisc.edu/Default.aspx?tabid=53&EntryID=545 Wed, 04 Jun 2008 20:42:00 GMT http://ipcm.wisc.edu/DesktopModules/Blog/Trackback.aspx?id=545 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. http://ipcm.wisc.edu/WCMNews/tabid/53/EntryID/544/Default.aspx spaced@hort.wisc.edu http://ipcm.wisc.edu/Default.aspx?tabid=53&EntryID=544 Wed, 04 Jun 2008 20:31:00 GMT http://ipcm.wisc.edu/DesktopModules/Blog/Trackback.aspx?id=544 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?” http://ipcm.wisc.edu/WCMNews/tabid/53/EntryID/543/Default.aspx spaced@hort.wisc.edu http://ipcm.wisc.edu/Default.aspx?tabid=53&EntryID=543 Thu, 29 May 2008 14:56:00 GMT http://ipcm.wisc.edu/DesktopModules/Blog/Trackback.aspx?id=543 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. http://ipcm.wisc.edu/WCMNews/tabid/53/EntryID/538/Default.aspx spaced@hort.wisc.edu http://ipcm.wisc.edu/Default.aspx?tabid=53&EntryID=538 Wed, 28 May 2008 20:05:00 GMT http://ipcm.wisc.edu/DesktopModules/Blog/Trackback.aspx?id=538 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. http://ipcm.wisc.edu/WCMNews/tabid/53/EntryID/529/Default.aspx spaced@hort.wisc.edu http://ipcm.wisc.edu/Default.aspx?tabid=53&EntryID=529 Wed, 21 May 2008 20:53:00 GMT http://ipcm.wisc.edu/DesktopModules/Blog/Trackback.aspx?id=529 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. http://ipcm.wisc.edu/WCMNews/tabid/53/EntryID/524/Default.aspx spaced@hort.wisc.edu http://ipcm.wisc.edu/Default.aspx?tabid=53&EntryID=524 Thu, 15 May 2008 19:25:00 GMT http://ipcm.wisc.edu/DesktopModules/Blog/Trackback.aspx?id=524 Due to the uniqueness in managing CRP fields, we have developed specific factsheets to help in developing management plans for these listed species in CRP fields (see links). http://ipcm.wisc.edu/WCMNews/tabid/53/EntryID/517/Default.aspx spaced@hort.wisc.edu http://ipcm.wisc.edu/Default.aspx?tabid=53&EntryID=517 Thu, 08 May 2008 22:46:00 GMT http://ipcm.wisc.edu/DesktopModules/Blog/Trackback.aspx?id=517 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. http://ipcm.wisc.edu/WCMNews/tabid/53/EntryID/509/Default.aspx spaced@hort.wisc.edu http://ipcm.wisc.edu/Default.aspx?tabid=53&EntryID=509 Wed, 07 May 2008 16:47:00 GMT http://ipcm.wisc.edu/DesktopModules/Blog/Trackback.aspx?id=509 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. http://ipcm.wisc.edu/WCMNews/tabid/53/EntryID/506/Default.aspx spaced@hort.wisc.edu http://ipcm.wisc.edu/Default.aspx?tabid=53&EntryID=506 Thu, 01 May 2008 21:25:00 GMT http://ipcm.wisc.edu/DesktopModules/Blog/Trackback.aspx?id=506