Weeds could develop resistance to dicamba in three generations

In Delta Farm Press

What happens if farmers follow the same practices they have when other new herbicide chemistries have come on the market over the last several decades?

If they’re not careful, they will simply replace one herbicide with another, as they did with Prowl and Treflan, ALS herbicides, glyphosate and most recently with PPO inhibitors such as Flextar and Reflex. Continue reading

If your weed control is working, it’s time to change it, says weed scientist

in Delta Farm Press

It might seem like an odd recommendation to make – to change something if it’s working.

But that’s what Bob Scott, Extension weed scientist with the University of Arkansas System Division of Agriculture, said during a presentation at Pigposium 3, held at East Arkansas Community College in Forrest City. Continue reading

Growers must be careful when using new herbicide technologies

In Delta Farm Press

Rules surrounding new weed-fighting technologies don’t make for a short, or uncomplicated, list, says Ples Spradley.

First off, “Applications of products (Xtendimax, Enlist Duo and Engenia) shall not be made to Enlist or Xtend seed technologies without’” completing new training, the Arkansas Extension pesticide safety education specialist told the crowd at the recent Pigposium 3 in Forrest City, Ark. “If you’re an applicator – private, commercial, non-commercial or commercial applicator technician – and will use those herbicides on those technologies, you must go through our training. The new regulations state that you cannot apply Xtendimax in Arkansas between April 15 and September 15, with a limited exception for pasture applications.” Continue reading

What do farmers think about resistant weeds?

in Southeast Farm Press

Both scientists and regulators have had a lot to say about the growing problem of herbicide resistance and how weed management techniques need to change in response. However, there have been few organized opportunities for farmers to make their voices heard and to share their experiences in managing herbicide-resistant weeds.

This is changing with a series of seven regional listening sessions sponsored by the Weed Science Society of America, the United Soybean Board and the U.S. Department of Agriculture Animal and Plant Health Inspection Service. Farmers across the nation are being invited to share their challenges, successes and opinions. Continue reading

Diversity is necessary in weed control

in Southwest Farm Press

South Texas, or coastal Texas, is a unique region of the greater Southwest, marked by a sub-tropical climate, unique soils and a host of both advantages and disadvantages when it comes to agriculture.

The warmer climate allows for an extended growing season, and its relationship with the tropical Gulf of Mexico offers some clear advantages, like seasonal rains, but also unique challenges, not the least of which is an environment conducive to the rapid growth and propagation of noxious and damaging weed varieties. Continue reading

Tomorrow at 3 PM ET: Learn about a pigweed decision management tool

Herbicide resistance in Palmer amaranth (known as Palmer pigweed) is a serious issue in the Southern US and is spreading to several other states. Repeated use of a few herbicide mechanisms of action (MOA) without sufficient management diversity is the common cause of this resistance. A proactive resistance management strategy that integrates diverse chemical and non-chemical tools will help prevent/manage resistance and preserve the utility of available herbicide options.

This webinar provides a general overview and demonstration of a new Microsoft-Excel based decision support tool that guides informed decision making for effective management of this weed, with particular focus on soil seedbank management and profitability. Users can build their own management programs and see for themselves how effective their pigweed management program is, as well as overall economic outcomes associated with their options. This tool also predicts the likely risk of resistance for the management program built by the user.

Date and time: Wednesday, February 15, at 3 PM Eastern time Continue reading

Resistance management still important even with new herbicides

In Southeast Farm Press

by Brad Haire

Herbicide-resistant weeds didn’t fall from the sky or rise from fields in a mutant mutiny, but they are here nonetheless. With new herbicide technologies going mainstream this season, growers must continue dogged resistant-weed management programs to preserve viable chemistries for as long as possible.

“In general, herbicide-resistant weeds become a problem over time when they are selected to survive by the overuse of a single herbicide or single mode of action. In all weed populations, there are very low levels or frequencies of herbicide-resistant plants in comparison to susceptible plants,” said Eric Prostko, University of Georgia Extension weed specialist during an American Society of Agronomy webinar “Growing for Tomorrow: How Weed Resistance Management Can Lead to Sustainability” Feb. 1 sponsored by BASF. Continue reading