A collection of new soybean herbicides from MANA aims to incorporate multiple modes of action into weed-control programs.
"There clearly is a place for an early foundation pre-emergence pre-mix soybean herbicide that simplifies requirements for multiple products," says James Whitehead, technical development manager for MANA Crop Protection.
"That is, it’s put out as a pre-emergence product to be followed sequentially in-season with a post-emergence material. And we want convenience there and that we put multiple modes of action together, whether it be two or three, and the multiple modes of action will come in and control the weeds that we’re targeting."
Management of PPO inhibitors, whose function is to break down cell membranes in weeds, also represents a concern for the company.
"We’re putting a lot of selection pressure on PPOs," Whitehead says. "We’ve got to be careful we don’t overuse those and burn them out. Because we do not have new modes of action coming in that can take their place."
The following are highlights of the new soybean herbicides, as spotlighted by Whitehead this week during a crop consultant meeting in Memphis. Click on the herbicide name to learn more on the MANA website.
Vise (active ingredients: metolachlor and fomesafen)
- Good soil residual activity
- Good activity on small-seeded broadleaf weeds, where resistance often originates
- Two residual modes of action for resistant weed management
- Unique compatibility with premium glyphosates
- Excellent crop safety
- Flexibility to common rotationoal crops
The product has some limitations, Whitehead says, including rate limitations throughout the season and some yearly use limitations.
Tailwind (active ingredients: metolachlor and metribuzin)
- Employs often underutilized metribuzin, a photosynthetic inhibitor
- Good soil residual product
- Great activity on small-seeded broadleaves
- Reduces selection pressure on ALS and PPOs
He cautions that some soybean varieties are more sensitive than others to specific products.
Rumble (active ingredient: fomesafen)
- Good activity on small-seeded broadleaves
- Unique compatibility with premium glyphosate and paraquat formulations
- Generally accepted to be rainfast
Fomesafen is one of the few products that can go out post-emergence to control Palmer amaranth, Whitehead says. That means Rumble can serve as a bridging strategy to MANA’s unique products planned for the future, products that will serve a growing market.
Torment (active ingredients: fomesafen and imazethapyr)
- Can be applied pre-emergence up to 45 days prior through early post-emergence
- More than 65 weeds on the label
- Can be tank-mixed to increase management of pigweeds and grasses
Farmers in the mid-South likely won’t find that Torment fits as well as in more northern areas because of rotational restrictions around cotton, Whitehead says. The rotational interval for cotton is about 18 months, a pretty wide window given fluctuating commodity prices. Additionally, ALS- and PPO-resistant populations occur in some areas.
The crop-protection company also will be formulating and evaluating its forthcoming Outflank product during the 2013 season, Whitehead says. Several mixtures look promising and will go beyond what Torment delivers in the marketplace, and the product should be flexible enough to be used in the mid-South without having rotational problems, he says.