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The primary reason for greater consistency of postemergence herbicides is that they are applied directly to the foliage of the target plant, rather than being applied to the soil and then having to be absorbed by the weed. However, bypassing the soil does not totally eliminate performance problems with these products. Consistent performance is dependent upon selecting the correct product for weed species found in the field, applying the product to actively growing weeds at the appropriate growth stage, and finally, using appropriate application techniques. One important criteria that causes confusion and problems is the selection of spray additives for use with postemergence herbicides.