12 days

Keywords.Activities.Herbicide Application Methods.Spraying, Keywords.Activities.Herbicides.Vapam, Keywords.Photographers.A Posadas, Keywords.Places.San Diego County.Murray Reservoir.Vapam Test Plots, Keywords.Weeds.Hydrilla (Hydrilla verticillata), Keywords.Weeds.Hydrilla (Hydrilla verticillata).After Treatment.By.Vapam, Keywords.Weeds.Hydrilla (Hydrilla verticillata).After Treatment.Time Elapsed.12 days, Keywords.Weeds.Ratings.A Rated, Keywords.Year.1981