Effect of dormant-season applications of 2,4-D on pruned and nonpruned Tokay grapes

In one experiment, Tokay grapevines pruned in December were sprayed 16 days later with either a water- or oil-soluble amine of 2,4-D at various concentrations. Spray was applied to vine plus soil, base of trunk plus soil, and soil only. An ester form at 10,000 ppm was applied to soil only. Spray treatments using the water-soluble amine were repeated on another series of vines in February. All treatments were repeated on unpruned vines.