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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

September Last Monday Grant Webinar for Fruit and Vegetable Growers (reboot)

September 30, 2019
4:00 pm

Are you curious about what grants are available to help your farm business?

To help disseminate information on grants on a consistent basis, ENYCH is offering a "current grants" webinar on the last Monday of every month at 4:00pm

Each month's webinar focuses on 1 grant.  The September Webinar will focus on the NYS New Farmer Grant offered by NYS Empire Development.
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Allium Leafminer IPM Twilight Meeting

October 3, 2019
3:00pm - 5:00pm
Hurley, NY

Learn to identify and manage Allium Leafminer (ALM) in your allium crops.
 
Eastern New York Commercial Horticulture Specialists Ethan Grundberg and Teresa Rusinek will recap allium leafminer biology and distribution, discuss host preference and provide a tour of the research plots at the Hudson Valley Farm Hub. The research focuses on the use of reflective mulch to suppress ALM ovipostion on allium plants and insecticide application timing trial on leeks. The research aims to provide growers with targeted strategies to efficiently and effectively manage ALM. We welcome growers to bring securely bagged samples in clear plastic bags. Ample time will be provided for discussion.

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October Last Monday Grant Webinar for Fruit and Vegetable Growers

October 28, 2019
4:00 pm

Are you curious about what grants are available to help your farm business?

To help disseminate information on grants on a consistent basis, ENYCH is offering a "current grants" webinar on the last Monday of every month at 4:00pm

Each month's webinar focuses on 1 grant.  The October webinar topic is TBD but might feature Ag Labor Housing Grants.
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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

Biweekly Vegetable News Podcast - Episode 10 - 09/05/2019

September 5, 2019
The September 5th, 2019 edition of the Eastern New York Vegetable News covers the following topics:

Nitrogen Fertility in Overwintered Spinach (1:13)
Sweet Potato Harvest Practices (6:43)
Brassica Downy Mildew (14:44)
Purple Blotch and Stemphylium Leaf Blight (20:17)

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