Increase of Herbicidal Action of Concentrate 40 and Oil Emulsion by 2,4-D

Abstract

Concentrate 40 + 2,4-D and oil emulsion fortified with Santophen 20 + 2,4-D both suppressed "cohitre" (Commelina longicaulis), and "bejuco de puerco" (Ipomoea spp.) more than the same nonselective sprays without 2,4-D. They also suppressed more weeds than 2,4-D alone. Results indicated that Concentrate 40 and oil emulsion fortified with Santophen 20, when used with 2,4-D did not inhibit the lethal effects of 2,4-D and that it might be more effective than either nonselective herbicide when used alone on grass control. Five plots of Bermuda grass were treated with Concentrate 40 and 5 with 0.1% Na salt of 2,4-D in Concentrate 40 at the rate of 175 gal./acre. Two spray treatments were made at 4-week intervals. Addn. of 2,4-D to Concentrate 40 increased its herbicidal action against Bermuda grass by 50%.