Sequential Applications of Preemergence and Postemergence Herbicides for Large Crabgrass (Digitaria sanguinalis) Control in Tall Fescue (Festuca arundinacea) Turf

摘要

Preemergence (PRE) and postemergence (POST) herbicides were sequentially applied to tall fescue over a 2-yr period to determine the lowest herbicide rates needed for acceptable large crabgrass control. Prodiamine was the only PRE herbicide that provided full-season large carabgrass control in tall fescue turf. The control was 85/100 in plots treated at one-third recommended rate (0.3 kg/ha) and 96/100 at the full rate (0.8 kg/ha). Sequential application of oxadiazon at one-third rec- ommended rate (1.1 kg/ha) in late February followed by fenoxaprop (0.2 kg/ha) in June controlled 85/100 large crabgrass in late August.