What are effective ways to control weeds with the Enlist system? Check out this video for more info on your three options when it comes to POST herbicides for ultimate weed control.
Categories: Agronomy, Agronomy Talk
2020 was the second year we conducted our Enlist System Study where we evaluate different combinations of herbicides both with an in-season residual and without.
Check this video with Joe Bolte to learn more!
Wondering what the best carrier rate for Enlist One? Check out this video featuring Joe Bolte, PFR Technician/Herbicide Specialist, to learn more about our findings from our 2020 demo plots.
When should you make your POST herbicide applications?
The most important thing to remember is to actively scout your fields and make sure you're spraying when weeds are less than 4 in. tall!
Over the last few years, we've focused on honing in on the Liberty/glyphosate and the tank-mix combo, including things like proper coverage, spray tips. This year, we've also started running surfactants.
This PFR study is designed to evaluate Liberty and glyphosate and their carrier rates. Why is this important? Because one is a contact and one’s systematic herbicide, their coverage requirements are different.
Going into 2021, a lot of the trait platforms available have Liberty in them. Liberty is a great product that can help control those glyphosate-resistant weeds we've struggled with the past few years.
To be successful in non-GMO soybeans fields, especially those with weeds resistant to multiple herbicides, apply the same management principles as GMO soybeans. These principles become more critical with non-GMO soybeans because rescue options are much more limited.
There are many effective post-emerge herbicide options available, but what happens if the soybeans are beyond the growth stage at which Liberty® can be applied? Depending on the trait platform, once we reach the R1 growth stage, soybeans must be managed like a glyphosate-tolerant soybean.
Enlist One® or Enlist Duo® 2,4-D choline are both very effective on glyphosate-resistant (GR) marestail, giant ragweed, and waterhemp. Just like glyphosate, Enlist One is a systemic herbicide, meaning coverage is not as crucial as it is with a contact herbicide. One approved tank-mix partner for Enlist One is Liberty®. The addition of Liberty provides two effective SOAs for GR marestail, giant ragweed, and waterhemp. When spraying Liberty alone, Beck’s Practical Farm Research (PFR)® data has shown a 12% increase in control when using a carrier volume of 20 GPA vs. 15 GPA.
Enlist One® + Liberty® is very effective when it comes to glyphosate-resistant (GR) broadleaf weeds, especially in high-pressure scenarios. However, there may be other weeds, like grasses, that you are trying to control.
Beck’s Practical Farm Research (PFR)® data has shown Enlist One® + Liberty® resulted in very effective control of glyphosate-resistant (GR) waterhemp and marestail.
What is the best time of day to make Liberty applications?
Liberty® and glyphosate are considered to be weak acid herbicides. Water hardness will greatly influence the performance of a weak acid herbicide. Much of the spray water many applicators use comes from wells and is considered to be “hard water.”
Contact products like Liberty® require proper coverage to achieve successful weed control. One factor that will influence coverage is the carrier rate. Beck’s Practical Farm Research (PFR)® data shows a 12% increase in waterhemp control when Liberty is sprayed at 20 GPA vs. 15 GPA. Contact herbicides do not move in the plant like a systemic herbicide such as glyphosate does. Therefore, control will be heavily impacted if a contact herbicide does not cover the entire plant.
Glyphosate is effective on many of the same weeds on which Liberty is weaker, like grasses, velvetleaf, etc. Therefore, manage a Liberty + glyphosate application just like Liberty alone, since the Liberty is doing the heavy lifting.
Contact products like Liberty® require thorough coverage due to lack of herbicide movement in the plant. This means that the herbicide must come in contact with the plant tissue in order to achieve control. Systemic products such as glyphosate can translocate throughout the plant, making coverage not as crucial.
Canopy closure is one of the best defenses to prevent the germination of weeds. The competition from canopy closure will reduce the amount of light, making it much harder for weeds to germinate. When applying a pre-emerge herbicide, followed by an in-season residual, the goal is for the blanket of protection to last until canopy closure. Therefore, it is critical for the residual herbicide to last until canopy closure, which may not occur on wider rows. Beck’s Practical Farm Research (PFR)® data shows narrow rows can help reduce waterhemp pressure in the untreated check.
Do you face the same challenging weeds you faced 20 or 30 years ago? In the past 30 years, farmers have adopted more soil conservation practices such as no-till and shallower tillage methods. This shift in tillage practices will impact the weed species in your fields.
Cover crops not only play an important role in soil heath, but also in weed control. Cover crops can reduce selection pressure on current, effective herbicide options, and they can also suppress weeds due to the large amounts of biomass they produce. Similar to canopy coverage, biomass will shade the soil and reduce weed emergence.