Among the weed control options, herbicide is certainly one to be considered for weed control in turfgrass; however, little has been published about herbicide selectivity, specially under Brazilian landscape conditions. Therefore, this research was conducted at USP/ESALQ, Piracicaba-SP, Brazil, to evaluate herbicide selectivity to turfgrass of pre-planting application herbicides (sulfentrazone at 1.4 kg a.i.ha-1 and oxadiazon 1.0 kg a.i.ha-1) and post-emergence application herbicides (halosulfuron at 112.5 g a.i.ha-1, 2,4-D at 2.010 kg a.i.ha-1 and MSMA at 2.4 kg a.i.ha-1), in five species of turfgrass: Axonopus affinis Chase, Zoysia japonica, Cynodon dactylon, Zoysia matrella and Stenotaphrum secundatum. It was concluded that herbicide selectivity to the turfgrass species studied is a function of the grass species and herbicide type and rate sprayed. Among the tested herbicides, halosulfuron at 112.5 g a.i.ha-1 and 2,4-D at 2010 g a.i.ha-1 were the most selective ones, and the grass species of the genus Zoysia (Z. aponica and Z. matrella), were, in general, the most tolerant to all the herbicides tested.
Axonopus affinis; Zoysia japonica; Cynodon dactylon; Zoysia matrella; Stenotaphrum secundatum
