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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

Precision Pruning for Apple Crop Load Management

January 30, 2020
Plattsburgh, NY

Crop load management begins well ahead of petal fall! Join Mike Basedow as he reviews preliminary results from the 2019 Champlain Valley precision pruning trials and offers some suggestions on how commercial orchards can incorporate these principles into their own pruning program heading into the 2020 growing season.

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High Tunnel Tomato Production Farmer to Farmer Workshop-Poughkeepsie

February 4, 2020
Poughkeepsie, NY

Join us for a day-long program featuring grower presentations, small group discussions and demonstrations, and extension presentations focused on a number of production topics.  These will include fertility management, injection systems, grafting, variety selection, pruning, trellising systems, pest and disease management, and more!

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High Tunnel Tomato Production Farmer to Farmer Workshop-Saratoga

February 6, 2020
Saratoga Springs, NY

Join us for a day-long program featuring grower presentations, small group discussions and demonstrations, and extension presentations focused on a number of production topics.  These will include fertility management, injection systems, grafting, variety selection, pruning, trellising systems, pest and disease management, and more.

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Announcements

Resources from CCE ENYCHP!

We are developing new ways to connect with the CCE ENYCHP team this year! We have a Youtube page located at this link. Check out videos on Table Grape Production, Pest Updates and the 20 Minute Ag Manager - in 4 Minutes series

We have a Facebook Page here as well as an Instagram page. We keep these places updated with current projects, events, and other interesting articles and deadlines.

There are also text alerts available. Fruit and vegetable farmers in 17 Eastern NY counties can now receive real time alerts on high risk disease and pest outbreaks texted directly to their cell phone. The Eastern NY Commercial Horticulture program, which is supported by local Cornell Cooperative Extension associations, will now offer text alerts to those that enroll in our program in 2019. 

The text alerts will be reserved for important crop alerts that could impact management decisions immediately. For instance, if there were an outbreak of Late Blight in the area, this would be transmitted to vegetable growers.

Farmers can choose the crop for which they wish to receive updates. Additionally they can request that Ag Business Alerts be sent to them. These alerts might include due dates for crop insurance deadlines, market opportunities etc.

If you have questions, please contact enychp@cornell.edu


Podcasts

Climate Change Adaptations

September 30, 2019
In this episode regional vegetable specialist Elisabeth Hodgdon interviews University of Vermont PHD student Alissa White about a series of interviews with growers in the north east concerning climate change adaptations.

Listeners can access Alissa White’s climate change adaptation survey report and additional information on the project by clicking on the following link:

https://adaptationsurvey.wordpress.com/results/
Alissa’s project was sponsored by a Northeast SARE Graduate Student Grant (GNE17-163).

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