Mark VanGessel, Extension Weed Specialist; firstname.lastname@example.org
Due to the warm weather and good growing conditions, weeds in no-till soybean fields are larger than “normal” for early May. A few things to consider if the fields have not been treated yet:
● Coverage is important due to dense vegetation, keeping gallons per acre in the 20 gallons per acre range is important.
● While 2,4-D can help with some highly sensitive species (primrose), replanting intervals and proximity to sensitive crops will limit its use now.
● Don’t try cutting rates, weeds are large and often reduced rates will not effectively control them, even higher rates may not provide 100% control.
● Choose your herbicides carefully; if multiple species are present more than one herbicide will be needed and be sure they are compatible with one another, and they are going to provide benefit to your situation
● Be realistic in your expectations, controlling large dense populations of weeds is difficult, prioritize those species that are of the biggest concern. Remember a follow up in-crop application may need to be needed sooner than usual after planting to help control some species not killed by burndown treatments.