Controlling winter annual broadleaf weeds in wheat
These herbicides are active primarily through foliar uptake and have limited soil activity, so ideally they should be applied to plants with viable foliage and when temperatures are 50 degrees or higher to achieve optimum performance. If applying MCPA or 2,4-D with topdress nitrogen fertilizer, the ester formulation needs to be used as amine formulations are not compatible with liquid N fertilizers.
Marestail historically has been controlled effectively in wheat with fall or early spring applications of many commonly used wheat herbicides. However, it appears that ALS-resistant marestail is also now present in a number of fields. As with the ALS-resistant mustards, using growth regulator herbicides or Huskie in a tank-mix or as an alternative to ALS herbicides will help provide control of the ALS-resistant marestail.
Starane or dicamba products generally do not provide very good mustard control, so wouldn’t be very good choices to help control ALS-resistant mustards, but would help with control of marestail.
Late applications for henbit control
Many producers like to wait to apply broadleaf herbicides until early spring, for a variety of reasons. This normally works well for control of mustard species, but is less effective for henbit control. Glean, Finesse, Ally, and Huskie are some of the best spring treatments for henbit control, but still should be applied before henbit starts to bloom to achieve the best results. Winter annual broadleaves do not generally cause much yield loss if left uncontrolled in the fall. However, these weeds should be sprayed in early spring when they are actively growing, but before they begin to bolt.