Dicamba Disruption – How Will You Kill Weeds After Court Voids Registrations? – AgFax Weed Solutions

Herbicide Application. ©Debra L Ferguson Stock Photography

Here is this month’s issue of AgFax Weed Solutions, sponsored by Nufarm’s Midwestern and Southern teams.
Editor: Owen Taylor
Web Editor: Ernst Undesser

In This Issue

Dicamba: A federal court voided the registration on three herbicides connected to dicamba-resistant crops. See an overview report plus advisories from three states.

By State: This month’s issue includes reports from Alabama, Georgia, Indiana, Iowa, Louisiana, Minnesota, Nebraska, Pennsylvania and Tennessee.

Scroll Deep: Three key reports you might have missed.

Search Results: At the bottom, we also have posted the top three reports that are triggering search engine referrals to our website this month. Topics include: choosing the right adjuvant, tank mixing for best results and deciding whether to spray in dewy conditions.

In an unprecedented ruling, a federal court voided the registration for three dicamba herbicides, XtendiMax, Engenia and FeXapan. The decision raises multiple questions about whether growers can still apply these herbicides in 2020 and what the future might hold for dicamba-tolerant technology. Here’s what’s known and not known.
With these key dicamba formulations off limits in Indiana, here are alternate approaches. Keep in mind: changing chemistries at this point won’t be as simple as just dumping something different in the tank and heading to the field to spray. Much depends on selecting the right products and tankmix combinations, plus setting up your equipment for optimum performance.
A federal court voiced registrations on three herbicides tailored by dicamba-resistant technology. How will this affect farmers’ weed control strategies? Steve Li, Alabama Extension Weed Scientist, responds to questions that farmers and crop advisors are asking him. As he emphasizes, this is a fluid situation with details still to come.
The repeal of the dicamba label leaves many farmers no effective postemergence herbicides for multiple-resistant waterhemp in Xtend soybean fields. So what are the most effective options to manage waterhemp?

Soybeans planted in late April or early May will soon reach the 45-days-after-planting restriction. While there will likely be legal challenges to the federal court ruling that voided key herbicide labels, farmers need to consider alternatives now as the time for effective postemergence applications is upon us.
Adjuvants serve multiple purposes, so you won’t find a “one size fits all product” to pour into your tank. Some work better than others, too, and others can inflict severe crop injury if used incorrectly. Tommy Butts, University Of Arkansas Extension Weed Scientist, sorts through field observations and research findings.
Glyphosate-resistant Johnsongrass hasn’t turned into a widespread problem…yet. But in parts of Tennessee, populations exist and are spreading. Your fallback plan, especially in corn, involves older herbicides that fell out of favor when Roundup Ready first took root.
Several factors determine the potential for herbicide carryover injury. Some you can’t control, others you can.

Due to dry conditions, soil-applied corn herbicides never received enough rain for proper activation, leading to escapes. Here are possible approaches and options for dealing with the weeds that made it through.
Cracking sprays have cranked up in parts of the Peanut Belt but more will go out soon. Here are quick observations and recommendations from Eric Prostko, University Of Georgia Extension Weed Specialist.
Lousy weather this spring kept many Nebraska farmers from applying herbicides during the preemerge period, and that has thrown the focus on weed control into the post-emerge phase. Here are ideas and approaches if you’ve been caught.
Even in June, we’re still talking about ryegrass in Alabama corn. The unusually wet winter and early spring may have delayed many PRE and early-POST applications on troublesome weeds like ryegrass. Here are potential control options.

3 Key Reports You Might Have Missed
Okay, you’ve seen plenty of lists that suggest ways to prevent or cope with herbicide resistance. This one is different. It starts with the way the wrong tank-mix combinations can make resistance worse, much worse.
Palmer now packs enough resistance and cross resistance that a pre-emerge package by itself won’t be enough on an increasing number of soybean acres. Here are options.
Italian ryegrass has exploded in Louisiana on a huge scale. “Honestly, this is not surprising because we have not been addressing this pest properly.”
Top Search Engine Referrals This Month
Picking the right adjuvant can make the difference between profitable weed control and mistakes that will cost you money. Here’s a quick overview on the three types of adjuvants and how to pick the right one for your herbicides and conditions.
Tank mixing isn’t simple or foolproof. It takes patience, caution and knowledge to gain profitable results. And you need a recipe and an ordered approach like the one here.
Moisture on the leaf? Treat or hold off, spray or wait? A veteran weed scientists discusses research and also the tradeoffs if you delay treatments.


AgFax Weed Solutions is published by AgFax Media LLC. If you’re receiving this newsletter from us, either a friend or business contact asked us to forward the report to you or you are a regular subscriber to one of our crop, pest and issue-related reports covering states in the Corn Belt, South, Southwest and Far West.

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Questions? Contact Owen Taylor, 601-992-9488

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