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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

NYS Processing Vegetable Industry Roundtable Meeting

March 18, 2024
Batavia, NY

Processing vegetable industry members who grow, manage, or support crop production for Farm Fresh First/Nortera Foods, Seneca Foods and/or Love Beets, are encouraged to sign-up for the 2024 NYS Processing Vegetable Industry Roundtable! You will:

  • Network at this in-person meeting.
  • Learn the results of industry-funded research.
  • Have a voice in Cornell research and Extension.
  • Earn 3.25 DEC pesticide applicator recertification credits
  • Earn Certified Crop Advisor Credits
View NYS Processing Vegetable Industry Roundtable Meeting Details

Oswego Muck Onion Growers Pre-Season Meeting: Stop the Rot, Nematodes and SLB Fungicide Resistance

Event Offers DEC Credits

March 20, 2024
Phoenix, NY

Christy Hoepting and Frank Hay will get growers ready for the season with updates on managing Stemphylium Leaf Blight fungicide resistance, progress made towards understanding and managing bacterial bulb rot of onion, and results of the 2023 nematode survey and research project. 2.5 DEC recertification credits will be offered in categories 1A, 10 and 23.

View Oswego Muck Onion Growers Pre-Season Meeting: Stop the Rot, Nematodes and SLB Fungicide Resistance Details

2024 NYS Dry Bean Meeting and Cutting Event

Event Offers DEC Credits

March 22, 2024
Geneva, NY

The NYS Dry Bean Meeting will be paired with the annual Dry Bean Cutting Event again this year! The morning meeting will include presentations on the latest dry bean research in New York, with topics including market updates, white mold management, western bean cutworm management, dry bean variety testing, and incorporating NY dry beans into schools. 1.5 DEC credits will be available in categories 10, 1a, 21, 23. CCA credits will be available too.

The Dry Bean Cutting will follow the meeting and showcase the canned dry beans from the 2023 Dry Bean Variety Trial. 

View 2024 NYS Dry Bean Meeting and Cutting Event Details

Announcements

Management Practices for High Organic Matter Soils

We are exploring management practices for vegetable farmers with high organic matter soils. These soils are usually found in urban growing areas as urban farmers typically grow in imported soil mixtures that have been constructed over time and in high tunnels where leaching events are limited. In both cases, we see that soil pH and calcium levels can increase due to alkaline irrigation water and with grower inputs such as high levels of compost and/or fertilizer. We commonly see limited plant nutrient uptake due to high soil pH. We have produced four "Management Practices for Urban Soil Health" case studies sharing project updates in our urban cover crop, pH adjustment, and bulk density adjustment work. In each case study, we are looking at the effect of the management practice on soil and crop health. 

Management Practices for Urban Soil Health: Cover Cropping
Management Practices for Urban Soil Health: pH Adjustment
Management Practices for Urban Soil Health: pH Adjustment in NYC
Management Practices for Urban Soil Health: Correcting Nutrient Test Results for Soils with High Organic Matter

2023 Year in Review and 2024 Preview

As the Cornell Vegetable Program reflects on 2023, we want to thank you for your partnership and continued support of our team and the work we do to address issues impacting the commercial vegetable industry in the western and central portion of NYS. Our 2023 Year in Review and 2024 Preview report highlights of some of the many research and outreach programs led by our team members over the last year plus a look ahead to some of our plans for 2024.
  • Use of Ground Barriers as a New Strategy for Swede Midge in Brassicas for Small Organic and Urban Farms
  • Cornell Vegetable Program Responds to Late Blight in 2023
  • Working Groups Help to Improve the Western NY Food System
  • Field Trials Completed to Test Lasers as a Bird Deterrent in Sweet Corn
  • Increased Monitoring of Western Bean Cutworm in Dry Beans
  • Sweet Potato Varieties Suitable for Western NY Production?


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