With high-density trellised systems for apples, the goal is to maximize yield, and a good fruit-bearing surface is needed to do that, says Andy Arnold, horticulturist with Valley Fruit Orchards in Yakima, Washington. He uses Promalin (6-benzyladenine and gibberellins) either as a spray or as a paint mix with ­scoring to stimulate branching. For the spray, he uses 16 ounces of Promalin with 1.2 ounces of surfactant in five gallons of water, aiming for a pH level of 5.5. For the paint mixture, he combines 3.2 ounces of Promalin with 8 ounces of latex paint and 8 ounces of water, […]