Control of Prostrate Spurge (Euphorbia humistrata) and Large Crabgrass (Digitaria sanquinalas) in Container Grown Ilex crenata ‘Compacta’ With Herbicide Combinations
Abstract Granular herbicide combinations were evaluated for longevity of prostrate spurge (Euphorbia humistrata Engelm.ex.Gray) and large crabgrass (Digitaria sanguinalis L.) control. Rout (oxytluorfen + oryzalin), Ornamental Herbicide 2 (oxytluorfen + pendimethalin), Ronstar plus Modown (oxadiazon + bifenox) and Ronstar (oxadiazon) were applied at labeled rates and twice labeled rate in container grown Compact Japanese Holly (Ilex crenata ‘Compacta’). Weeds were reseeded each month but herbicides were not reapplied. The normal use rate controlled both weeds during the first 30 days after treatment (DAT) while twice this rate controlled the weed species at 60 DAT. No herbicide treatment effectively (>80%) controlled prostrate spurge 90 DAT. The high rate of Rout controlled (>80%) crabgrass at 90 DAT. Weed numbers and above ground biomass retlected visual control ratings. Compact Japanese Holly was not injured by any treatment.