To be successful in the fight against weeds, growers need a customized weed-control program. DuPont Crop Protection offers several new and proven options to make tank mixtures work harder and better.
Invest Now or Pay Later
Lower commodity prices may make it tempting for farmers to cut corners on weed control. But Louisiana State University weed scientist Daniel Stephenson points to glyphosate-resistant pigweed and ryegrass as prime examples of why a wait-and-see approach to weed control is a bad idea. “Invest now or pay later,” advises Stephenson. “If you back off weed control and get bit, you’re going to get bit hard.”
Start Clean, Stay Clean
Applying glyphosate or glufosinate alone will not provide adequate control of resistant or hard-to-control weeds, including Palmer amaranth, morningglory or yellow nutsedge.
Using more than one mode of action and layering residual herbicides is an important component of effective weed-control programs, says Louisiana crop consultant Ashley Peters.
“We may start with a preplant application of glyphosate plus 2,4-D plus DuPont™ Afforia®, Canopy® EX or LeadOff®,” says Peters. “Then we may follow with DuPont™ Canopy® DF plus metolachlor at planting, and an application of DuPont™ Classic® plus glyphosate (on Roundup Ready soybeans) or Liberty (on LibertyLink soybeans) plus metolachlor and/or fomesafen early postemergence to get soybeans to canopy. It’s a ‘start clean, stay clean’ program that works well.”
When selecting a DuPont preplant/preemergence program for soybeans, pay special attention to rotational crop requirements associated with chlorimuron ethyl, especially for rice and on high pH soils. This is also important with postemergence herbicides containing fomesafen, which help control Palmer amaranth.
Soybean Weed-Control Programs
Weather and workload allowing, it’s best to stay ahead of weeds with a preplant foundational residual herbicide. A residual herbicide application is the first step in battling resistant weeds and achieving cleaner fields this season. Timely planting is key to maximizing soybean yield, which means growers should think carefully about how herbicide choices will affect preplant intervals, says DuPont Pioneer agronomy research manager Dan Poston. Preemergence applications of DuPont™ Envive® or Trivence® herbicides provide residual control allowing postemergence applications to be made closer to soybean canopy, reducing the number of in-crop herbicide treatments.
Whatever preemergence program is chosen for soybeans, consider these points:
- Start clean. Tank mix with an effective contact herbicide such as Gramoxone.
- Use rainfall for activation or start a postemergence program earlier than normal, within label constraints.
- Apply a postemergence herbicide containing fomesafen/metolachlor or fomesafen approximately 21 days after planting, plus glyphosate for Roundup Ready soybeans or Liberty for LibertyLink soybeans.
A proven tank-mix partner for glyphosate or glufosinate (Liberty), Classic® herbicide makes postemergence soybean weed control programs better by improving control of challenging broadleaf weeds, including yellow nutsedge, morningglory and hemp sesbania.
To see Envive®, Trivence®, Classic® and other products in action, visit the DuPont Southern Virtual Field Tour. In the media gallery, click the preemergence and postemergence tabs to see side-by-side demonstrations.
Products listed above may not be available in every state. Contact your local DuPont representative for more information.
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Gramoxone (Syngenta); Liberty and LibertyLink (Bayer CropScience); Roundup Ready (Monsanto)