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Fall Application of Dual Magnum for Yellow Nutsedge Control in Muck Onions

Christy Hoepting, Extension Vegetable Specialist
Cornell Vegetable Program

September 14, 2011

Fall Application of Dual Magnum for Yellow Nutsedge Control in Muck Onions
Yellow nutsedge (Cyperus esculentus L.) pressure is very high in certain muck areas where onions are grown. It appears to have become more of a problem in recent years. Onion growers and chemical company representatives believe that applying Dual Magnum, active ingredient metalochlor, in the fall can significantly reduce nutsedge pressure the following spring. However, weed scientists across the country do not believe that fall applications of metalochlor would have any effect on nutsedge populations the following spring, because the dissipation of metolachlor, is relatively rapid, 4-7 weeks in the northern United States. Dual Magnum is labeled as a fall application in field corn and soybeans only in Iowa, Minnesota, Minnesota, North Dakota, South Dakota and Wisconsin. For this use, there are restrictions on the label that state the date after which Dual Magnum may be applied, that soil temperature in the top 4 inches must consistently be 55°F and lower, and that tillage following incorporation must not exceed the 2-3 inch depth of incorporation.

Objectives:
1. To determine whether a fall application of Dual Magnum controls yellow nutsedge the
following spring in onions grown on muck soil in New York.
2. To determine onion tolerance to a fall application of Dual Magnum.

If applying Dual Magnum in the fall is effective at controlling yellow nutsedge in onions and does not cause an unreasonable amount of crop injury, we would like to pursue adding this use to the label in New York for onions grown on muck.

Trials were conducted in 2007-2008, 2008-2009 and in 2009-2010.


Fall Application of Dual Magnum for Yellow Nutsedge Control in Muck Onions (pdf; 1196KB)

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Upcoming Events

Agricultural Supervisory Leadership Certificate Program - ASL 105: Employee Development and Training

June 25 - June 30, 2024 : ASL 105: Employee Development and Training

Online course is delivered through the user-friendly platform, Moodle. Materials will be available starting June 19, and live Zoom discussions will occur every Tuesday at 3 PM ET from June 25 to July 30, 2024. 

Topic areas include:

  • Setting clear expectations for farm teams
  • Designing engaging training programs
  • Providing effective performance feedback 
  • Streamlining onboarding processes for new hires
  • Cultivating a culture of continuous learning and growth
  • Personalized coaching and career planning strategies for farm personnel

View Agricultural Supervisory Leadership Certificate Program - ASL 105: Employee Development and Training Details

Virtual Orchard IPM Scout Training 2

June 25, 2024 : Virtual Orchard IPM Scout Training 2

Virtual Orchard IPM Scout Training 2

Tuesday June 25, 1:30-3:30PM   

Join us for the second live, virtual training on scouting of major insect pests of apple orchards. Anna Wallis (NYSIPM Program), Mike Basedow (CCE ENYCHP), and Janet van Zoeren (CCE LOFT), will broadcast from orchards in their region to discuss best practices for monitoring. We will review monitoring/scouting procedures for major economically significant pests. We will also share resources available for helping with identification of pests and forecasting pest activity.  

Who is this for? Farmers, farm employees, and industry members with IPM & pest management responsibilities, looking for new or refresher training.

View Virtual Orchard IPM Scout Training 2 Details

Airblast Sprayer Calibration Workshop

Event Offers DEC Credits

July 9, 2024 : Airblast Sprayer Calibration Workshop
Kinderhook, NY

University of New Hampshire Extension Field Specialist Emeritus, George Hamilton will demonstrate the importance of and best techniques to calibrate air blast sprayers. Proper calibration will ensure effective, efficient, economical and legal spraying.  Inadequate spray coverage is usually the cause of poor spray efficacy and additional spray applications. Overuse of some sprays results in unhealthy residues and can lead to fines.

Calibration should be done several times each season, or when you incorporate any new equipment or repairs - from the tractor to the nozzle.  Join us for a refresher or send new employees for training.  This workshop is open for any grower that relies on an airblast sprayer to deliver plant protectants to fruit or vegetable crops. 

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This website (https://enych.cce.cornell.edu/) contains our calendar of upcoming programs and registration links. For updated programmatic information, technical resources and links to newsletters please see our program blog site: https://blogs.cornell.edu/enychp/.
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