Polymeric microcapsules of the herbicides atrazine and metribuzin: preparation and evaluation of controlled-release properties
1993
Dailey, O.D. Jr | Dowler, C.C. | Mullinix, B.G. Jr
Atrazine and metribuzin were microencapsulated within 5 different polymers by the solvent evaporation process using two different emulsifiers (for a total of 20 formulations). Herbicide efficacy studies on Florida beggarweed, smallflower morningglory, tall morningglory, and Palmer amaranth were conducted in the greenhouse. Nine of the 10 atrazine formulations were at least as effective as a commercial dry flowable formulation, and 5 exhibited superior herbicidal activity and controlled-release properties for over 32 weeks after treatment. The polymers demonstrating the most efficacy were cellulose acetate butyrate and ethylcellulose. Five of the 10 metribuzin formulations had activities comparable to or slightly less than the commercial formulation and exhibited controlled-release properties; the other 5 had moderate to low herbicidal activity.
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