Method to Use A Synergistic Composition

Abstract

This invention relates to a synergistic composition made of a herbicidally effective amount of a propanil-based product, such as SUPER WHAM® and the at least one ACCase inhibitor herbicide such as CLINCHER® in an amount sufficient to facilitate the herbicidal activity of the propanil-based herbicide. It has been found that this synergistic composition, when applied to a field of rice, allows a reduction in the amount of herbicide needed, greater flexibility in timing of the application and broad spectrum of weed control.

1 . A method to use at least 20 percent less propanil based herbicide to control weeds, while cultivating rice in a field, comprising the steps of: applying to said field an amount of a propanil based herbicide with a herbicidally ineffective amount of cyhalofop, to form a herbicidally effective composition, wherein the weight ratio of the herbicidal effective compound ranges from about 1 pound of propanil to about 0.009 to 0.04 lbs. of cyhalofop wherein the amount of propanil applied is selected from the group consisting of: the weeds are grass at 2 to 3 leaf stage and the amount of propanil is 2 pounds per acre; wherein the weeds are grass at 3 to 4 leaf stage and the amount of propanil is 3 pounds per acre; wherein the weeds are grass at 4 to 5 leaf stage and the amount of propanil is 4 pounds per acre and wherein the weeds are grass at 5 leaf stage and wherein the weeds are grass at 6 leaf stage and the amount of propanil is 6 pounds per acre. 
     
     
         2 . The method of  claim 1  wherein said composition comprises as an active ingredient an effective amount of a compound selected from the group consisting of insecticide, fungicide, bactericide, acaracide, nematicide, plant growth regulator, fertilizer, and plant nutrients. 
     
     
         3 . The method of  claim 1  wherein the propanil based herbicide and cyhalofop are individually applied to said field within 24 hours of each other. 
     
     
         4 . The method of  claim 1  wherein said propanil based herbicide and said herbicidally ineffective amount of cyhalofop is tank mixed. 
     
     
         5 . The method of  claim 1  further comprising adding a herbicide selected form the group consisting of thiocarbamates, chloroacetamides and auxins, wherein said weeds are larger than at a 6 leaf stage.