A roller applicator for treating plants with herbicides and other fluids comprises a nonabsorbent textured roller, a low-pressure fluid delivery system, and means for collecting and recirculating the fluid. The components of the apparatus act in cooperation with one another so as to minimize loss of material by drippage, spray drift, and holdup in the components of the device. The applicator can be used with solutions as well as wettable powders, emulsifiable concentrates, and other multiphase formulations without separation.
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