Sometimes chemistries don’t work well together. When one chemical prevents another from working as intended this is known as antagonism. One of the more common instances of this occurring in 2019 is in the case of using clethodium with Dicamba and 2-4D to deal with volunteer corn in soybeans.
In biochemistry, antagonism is the inhibition of or interference with the action of one substance or organism by another. Simply put, clethodium can’t do its job when paired with certain chemistries
There are a variety of elements working against us when we attempt to control Volunteer Corn while spraying Dicamba:
- TTI nozzels create larger droplets which decrease uniform coverage
- DRAs in Dicamba load increase droplet size
- An absence of AMS in Dicamba load due to regulations
Group 15 chemistries, like Warrant, have also been said to antagonize Clethodim.
3 Keys to Successful Applications:
- Crop oil is an absolute must in mix with a Dicamba load. A heavier rate provides a better kill
- Enlist nozzles and adjuvants have been shown to work better for clethodim
- A spray volume of 20 GPA is ideal
- Fusilade doesn’t have antagonism with clethodim and is a possible alternative.
Contact your Co-Alliance Agronomy team member if you’re experiencing frustrations with volunteer corn.