After four years of trial work, Nufarm knew that Panther Pro herbicide had excellent residual on some of the toughest weeds and provided outstanding burndown on broadleaves and grasses. On weeds up to 4 inches in height, Panther Pro by itself eliminated broadleaves and achieved greater than 90 percent control of grasses. And as the only liquid 3-way flumioxazin on the market, Panther Pro made resistance management easy.
Tough weeds such as marestail, common ragweed and lambsquarter were no match for Panther Pro. The new herbicide showed strong residual control over a wide range of soil types, organic matter and rainfall conditions. And following a preplant application of Panther Pro with a post-emergence application of Credit Xtreme (glyphosate) kept most fields clean of escapes.
All except for one weed: glyphosate resistant waterhemp. Nearly all farmers have faced this challenge, for waterhemp has a longer emergence window and documented resistance to multiple herbicides.
“Waterhemp has been a challenge since the late 1980's when ALS resistance began sweeping across the Midwest. Roundup Ready technology was a great solution for the end of the millennium and into the 21st century, but waterhemp soon developed resistance to glyphosate as well,” said Joe Steinlage, Customer and Brand Marketing with Nufarm Americas.
“Seeing waterhemp show up late in any field or plot is discouraging, so Nufarm wanted to make certain we were able to contribute to a long term solution for controlling waterhemp," Steinlage said.
So in 2017, Nufarm conducted trials focused on season-long control of glyphosate-resistant weeds.
To get a good look at different soil types and weed populations, the company spread the trials across the country. Trials were conducted in Kansas, Illinois, Iowa, Minnesota, Missouri, Nebraska, North Dakota, Ohio, Pennsylvania and South Dakota.
The system Nufarm used was not completely novel, but it worked:
- Seed. They planted either LibertyLink or Xtend soybeans.
- Burndown. They applied Panther Pro at preplant to pre-emergence timing. In difficult situations (late planting, large weeds), they added a tank mix partner. A number of options were available. They used paraquat and saw excellent results.
In many pre-emergence applications, the 12 oz/ac rate of Panther Pro worked well on its own, providing better post-emergence grass control activity than most other residual herbicides. In early preplant situations, where late emerging waterhemp can be particularly challenging, they used the higher 15 oz/ac rate.
- Post. For the post-emergence application, they saw great results with Cheetah on LibertyLink soybeans and Xtendimax on Xtend soybeans.
“We were really satisfied with the benefits we saw using the three modes of action in Panther Pro as a preplant or pre-emergence application. Labeled applications of Panther Pro deliver soil residual rates of metribuzin, and the ability to use high rates of all modes of action in a herbicide is important to managing waterhemp,” Steinlage said. “Panther Pro is an excellent foundation herbicide for LibertyLink or Xtend soybeans in the battle against glyphosate resistant waterhemp.”
To discuss programs that will keep soybean fields weed-free, contact your Nufarm rep.