To evaluate the tolerance of Authority, Authority Supreme and Valtera when applied in the early spring on established red and alsike clover, small plot research trials were conducted in the RM of Star City 0.5 miles south of Melfort, SK.1 Viper ADV was applied shortly before flowering.

The crop tolerance of red and alsike clover and weed control efficacy of spring-applied herbicides was evaluated in a field trial planted at Melfort, SK, 2020. The aim of the small plot replicated trial was evaluation of three spring-applied herbicides: Authority and Valtera at 1X and 2X recommended rates of application, Viper ADV, and Viper ADV tank mixed with Authority or Vaterra, and compare the applications to an unsprayed control (check).