Abstract
Field studies were conducted in 2007 and 2008 to determine the influence of foliar moisture on the performance of three postemergent granular herbicides against white clover, Trifolium repens L., and dandelion, Taraxacum officinale (Weber). The herbicides utilized were LockUp 3-Way (2,4-D/penoxsulam/dicamba), Scotts Turf Builder with Plus 2 Weed Control (2,4-D/MCPP-p) and Lebanon ProScape Fertilizer with Trimec Herbicide (2,4-D/dicamba/MCPP-p). Herbicides were applied to individual plots in the morning when dew was present and then later the same day when foliar moisture had dissipated. Weed control was assessed at intervals of approximately 2, 4 and 8 weeks after treatment. The presence of foliar moisture generally improved the performance of all herbicides evaluated. Given that commercial applications generally target a complex of weeds the results indicate that optimum performance of granular postemergent herbicides will occur when applications are made to moist foliage.
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