INTERACTION OF CLETHODIM WITH PYRITHIOBAC AND BROMOXYNIL APPLIED IN LOW-VOLUME

Greenhouse and field studies were conducted to determine the interacti on of clethodim sprayed in low volume with pyrithiobac or bromoxynil a nd to determine the influence of these mixtures on large crabgrass con trol. A low-volume, air-assisted spraying system was calibrated to del iver 26 L/ha and was compared to a conventional hydraulic fan spraying system calibrated to deliver 140 L/ha. Greenhouse data indicated that carrier volume had no effect on large crabgrass control with clethodi m. The addition of pyrithiobac to clethodim in mixture was antagonisti c compared to control with clethodim applied alone. The addition of br omoxynil to clethodim in mixture was synergistic. Field studies showed similar results.