Indaziflam Efficacy for Controlling Purple and Yellow Nutsedge From Seed and Tuber Establishment.

Indaziflam is a preemergence herbicide for use in warm-season turfgrasses with activity for controlling grassy and broadleaf weeds.  However, efficacy of indaziflam has shown to be inconsistent for controlling sedges which may be attributed to emergence from tubers rather than seed.  To test this hypothesis, greenhouse experiments were conducted at the University of Georgia to evaluate indaziflam applications ranging 9 to 280 g a.i./ha for controlling yellow nutsedge and purple nutsedge establishment from tubers or seed.  After 8 weeks, indaziflam at ≥17.5 g/ha provided excellent (>90%) control of yellow and purple nutsedge emergence from seed.  However, indaziflam provided no control of yellow or purple nutsedge from tubers at any rate tested.  Results suggest inconsistency of indaziflam applications for yellow and purple nutesedge control in the field is attributed to lack of efficacy for controlling emergence from tubers.