Indaziflam Utilization for Controlling Problematic Turfgrass Weeds

Indaziflam is a new herbicide which potentially provides pre- and postemergence control of broadleaf and grass weeds. Two studies were conducted to evaluate indaziflam control of several weed species utilizing different application regimes. Single applications included indaziflam applied at 40 or 60 g ai/ha in October or November, and 20, 40, or 60 g ai/ha in March. Sequential applications included indaziflam applied at 40 followed by (fb) 40 g ai/ha in October and March, 60 fb 20 g ai/ha in October and March, 40 fb 40 g ai/ha in November and March, and 60 fb 20 g ai/ha in November and March. Prodiamine and oxadiazon were also applied as standard comparisons. Indaziflam applied at 60 g ai/ha in November provided the most consistent control across weed species. This treatment controlled annual bluegrass > 90% 20 weeks after treatment (WAT) and large crabgrass > 90% 29 WAT. All sequential indaziflam applications (except for the 40 fb 40 g ai/ha in November and March) controlled annual bluegrass > 90%. All rates and timings of indaziflam controlled lawn burweed at least 40% greater than industry standards. Indaziflam applied at 40 g ai/ha in October and March controlled cock's-comb kyllinga 80%. Indaziflam provided better weed control and longer residual activity than industry standards in some cases, however, weed control varied among species.