Management Strategies That Worked In 2015

For better or worse, throughout many regions of the country 2015 provided the optimal growing season conditions for both crops, as well as unwanted invasive weed species, making the past few months ideal for evaluating the effectiveness of different weed control strategies.

N­eil Schumacher, Central Valley Ag (CVA) (Oak­land, NE) agronomy sales manager, says the two largest challenge weeds in his three state territory have been Roundup resistant marestail and waterhemp.

“Those two continue to express more resistance to Roundup and become more and more of a challenge each year,” he says. “We have other weed species that have some amount of resistance to Roundup throughout the state but those two seem to be the most prevalent and the most difficult for us to manage.”

The management strategies his team recommends to CVA growers to eradicate these weeds, according to Schumacher, is an always moving target.

“It’s been an evolving challenge for us, and we’ve promoted residuals and we’ve promoted fall applications for marestail,” says Schumacher. “And it’s like anything else; if you don’t see it in your own fields you assume it’s not really a problem for you.

“This year has really pronounced itself with both of those weed species just being more difficult than normal; we’ve had a lot of rain and a lot of good growing conditions for weed species. We’ve definitely gained some traction (in addressing the problem) but it’s been a challenge because Roundup was so easy for so many years, guys enjoyed that … and the cost was less expensive.”

Schumacher adds that many challenges remain for growers still grasping with the new post-glyphosate era of weed control.

“Roundup still works on some fields, but then you go to the field next door and it doesn’t work at all,” he explains. “So it’s always frustrating for growers to have the option of spending a lot less money on Roundup only then have to spend $15 to $20 more per acre on the other fields where glyphosate won’t work. So one of our big challenges has been helping the growers look at the risk and the cost of not managing it upfront vs. trying to battle both of those weeds post-season.”

Another challenge that has arisen with CVA’s altering of their herbicide resistance management plans is a shrinking window of opportunity with fall burndown applications, according to Schumacher.

“Those guys are in harvest and then any fall tillage that they might do, and we’re into our fall soil sampling program and fertilization applications, so the challenge for the herbicide program is preferably the soil is only 50 degrees or less so we don’t break that product down too much in the fall before it has a chance to work for us in the winter and into spring. That doesn’t really leave a wide window of time for us.”

Now, with the days of a one-time glyphosate application lasting the entire season long in the rearview mirror, Schumacher thinks CVA’s spring pre-emerge applications are “the fastest growing segment” of the herbicide program at the No. 13 CropLife 100-
ranked retailer.

“At least throwing in a pre-emergence with a residual, and the second step of that would be getting them to run at recommended rates instead of reduced rate (to save a little money), or at least look at coming back with a post application because both of these weed species are difficult to manage in a post-arena.”

Schumacher says he’s still seeing “a lot of water hemp poking up through soybeans” and that both the Liberty Link soybean systems and the coming dicamba and 2,4-D tolerant cropping systems “pose a lot of interest” in CVA’s trade area.

“If the dicamba is truly more manageable than it’s been in the past and doesn’t cause a lot of issues with drift and off target movement, that will probably be the one with the most potential for our guys,” Schumacher says.

Crop Protection Perspective

Valent U.S.A.’s John Pawlek, product development manager, says the company’s herbicide resistance management strategy that it recommends to growers, starts with always maintaining a full label rate of residual herbicide.

“Then the second part of that is to make sure we get the weeds when they are most easily controlled, which is at the seed or seedling stage of growth,” Pawlek continues. “And with the spread of resistant weeds continuing at a prolific pace, we also always recommend using multiple effective modes of action.”

Valent’s current anti-weed arsenal in soybeans includes Valor SX, Valor XLT, Fierce and Fierce XLT, according to Pawlek.

“In situations where there’s low weed pressure and no known history of resistant weeds, we recommend Valor SX (flumioxazin), and where we see a need to control larger seeded broadleafs and want a longer residual effect, we can go with Valor XLT (flumioxazin + chlorimuron-ethyl),” he says.

When resistant weeds enter the picture, Fierce (flumioxazin + pyroxasulfone) and Fierce XLT (flumioxazin + pyroxasulfone + chlorimuron-ethyl) are the main options depending on the circumstance.

“Fierce is great where the grower is running into annual grasses and resistant Palmer Amaranth and waterhemp — it’s two modes of action can both control that weed spectrum — and Fierce XLT is where you’re kind of bringing out the big guns with three effective modes of action. We’ve had great success with this approach.”

According to Pawlek, weed extension specialists have a three step approach to managing glyphosate, ALS or even the recently confirmed PPO resistance in soybeans.

“Academia has been very adamant about taking a three step approach: the first step is using a full rate of the residual herbicide in preemergence, then using multiple effective modes of action and finally use an overlapping residual with your postemergence application,” explains Pawlek.

Leave a Reply

3 comments on “Management Strategies That Worked In 2015

  1. Fierce XLT has 3 modes of action on PPO and ALS resistant waterhemp or Palmer?? And we wonder why farmers are confused!!

Weed Resistance Stories

Spray Drift
Special ReportsPressure’s Up On Drift Reduction
October 4, 2016
The pressure was already on for the ag industry to reduce drift. Now, after what the South experienced over the Read More
Sprayer Maintenance
Special ReportsSprayer Clean-Out Gets New Attention
October 3, 2016
In this era of glyphosate resistance, the new herbicide systems hitting the market will definitely help, say dealers, but if Read More
WinField booth Farm Progress
Special ReportsTalking Weed Management Strategies At Farm Progress 2016
October 2, 2016
The annual Farm Progress Show — this year staged in Boone, IA — is always a great place to catch Read More
Engenia soybeans
Special ReportsResistant Weeds Continue To Confound Control Efforts
October 1, 2016
In the annals of weed scientists, 2017 will mark a milestone of sorts. This will be the 60th anniversary of Read More
Trending Articles
Iowa waterways
Stewardship2,600 Iowa Farmers Commit $8.7 Million to Water Quality Practices
August 9, 2017
Iowa Secretary of Agriculture Bill Northey announced Tuesday that a record number of Iowa farmers signed up to install nutrient Read More
Greg Musson, Gar Tootelian
CropLife 100Cause of Gar Tootelian Fire Under Investigation
August 7, 2017
Over one hundred firefighters and equipment responded to a four-alarm shop fire at the Gar Tootelian, Inc. (GAR) facility in Read More
Rob Versprille
ManagementCeres Solutions, North Central Co-op Merger to Bring New Opportunities for Indiana, Michigan Farmers
August 1, 2017
More than 40,000 customers and almost 9,000 Indiana and Michigan farmers will begin doing business with the new Ceres Solutions Read More
CPS-Norwood-and-Dupont-reps
Eric SfiligojA Message to Ag Retailers: Do Tell Your Good Stories
July 26, 2017
As the daughter of a peanut farmer, Krysta Harden, Chief Sustainability Officer for DuPont Crop Protection, understands the importance ag Read More
Tim Hassinger Dow AgroSciences President and CEO
Crop InputsDow’s Tim Hassinger Named President, CEO of Lindsay Corp.
July 24, 2017
Lindsay Corp. has  announced the appointment of Timothy Hassinger as president and CEO and a member of its board of Read More
Stewardship‘Gonna Fly Now’ with Environmental Respect
July 20, 2017
One of the most memorable moments in movie history occurred in the Academy Award-winning 1976 film “Rocky.” Haven gotten his Read More
Latest News
Corn Seed
Seed/BiotechSeed Innovations Benefit All of the Seed Industry
August 17, 2017
Innovations from throughout the seed industry help address many of the economic, environmental and health issues we face as a Read More
SpreadersGVM to Introduce New Prowler at MAGIE
August 17, 2017
The newest Prowler in GVM’s line-up will be introduced next week at the Midwest Ag Industries Expo (MAGIE), August 23 Read More
AcreEdge bag
Seed/BiotechLandus Cooperative’s AcreEdge Seed Brand Gears Up for 2…
August 17, 2017
Growers in more than 26 Iowa and Minnesota counties are seeing field signs with a new brand name at end Read More
Engenia soybeans
ManagementCorn and Soybean Yield Forecasts Larger than Expected
August 17, 2017
The USDA’s August Crop Production report contained larger-than-expected forecasts for the 2017 U.S. corn and soybean crops. At 169.5 bushels Read More
ManagementU.S. Ag Secretary Introduces SCORE
August 17, 2017
U.S. Agriculture Secretary Sonny Perdue signed a new agreement to support new and beginning farmers. On August 5, Perdue joined Read More
CHS-FFA-Minnesota
CropLife 100CHS and FFA: A Homerun Partnership
August 17, 2017
CHS hosted the Minnesota FFA for its annual FFA night at CHS Field. FFA students, educators and CHS leadership enjoyed Read More
Greg Musson, Gar Tootelian
CropLife 100Gar Tootelian Foundation Donates Half Million Dollars t…
August 16, 2017
Students at Immanuel Elementary are looking forward to the first day of school for two reasons this year. One, they Read More
Water Drainage
StewardshipNew System Could Remove Two Water Pollutants from Ag Fi…
August 14, 2017
Algae blooms in the Gulf of Mexico use up the majority of the oxygen in the water, leading to massive Read More
Eric SfiligojThe Top 10 Crop Protection Companies, Post-Mega Mergers
August 14, 2017
Everyone loves a good Top 10 list. In fact, some prominent celebrities such as David Letterman spent much of their Read More
ManagementThe DuPont-Granular Deal, Dicamba Update, and Upcoming …
August 11, 2017
Matthew Grassi joins Paul Schrimpf for the second week in a row to talk about DuPont’s acquisition of Granular, as Read More
Soybeans weeds
HerbicidesOngoing Evaluation Key to Controlling Weeds, Improving …
August 10, 2017
As the sun bears down on record U.S. soybean acres this August, farmers keep their eyes on their fields to Read More
Young Corn Plants
Seed/BiotechMycogen Seeds Offers Novel Product to Battle Pythium, O…
August 10, 2017
After a season plagued by seedling diseases caused by cool, wet soils at planting, farmers have a new option to Read More
Corn Field
FertilizerProtect Applied Manure Straight From the Manure Pit to …
August 10, 2017
Farmers who use liquid manure to fertilize corn crops can now mix Instinct nitrogen stabilizer in their pit for easy Read More
Iowa waterways
Stewardship2,600 Iowa Farmers Commit $8.7 Million to Water Quality…
August 9, 2017
Iowa Secretary of Agriculture Bill Northey announced Tuesday that a record number of Iowa farmers signed up to install nutrient Read More
Natives-First-Purple_Prairie_Clover
Seed/BiotechLa Crosse Seed Continues Focus on Soil and Water Conser…
August 9, 2017
La Crosse Seed is doing its part to lead communication to ag retailers across the country on the importance of Read More
HerbicidesAg Secretary Perdue Comments on Dicamba Issue
August 9, 2017
Agriculture Secretary Sonny Perdue indicated to reporters this week that he would like to see the industry work out a Read More
Treated-Seed-in-planter
Seed/BiotechSeed Treatment Q&A: Insight from Iowa State’s…
August 8, 2017
Technology has changed drastically since the 1990s. Televisions are thinner, phones are smaller and tractors can steer themselves. Technology has Read More
soybeans
Seed/BiotechWhen and Why to Double Inoculate Your Soybeans
August 8, 2017
Double inoculation is the act of using a double application of a rhizobial inoculant. This quickly establishes high populations of Read More