TY - JOUR T1 - Effect Of Trunk Injection Of Flurprimidol And Paclobutrazol On Sprout Growth In Silver Maple JF - Arboriculture & Urban Forestry (AUF) JO - JOA SP - 233 LP - 236 DO - 10.48044/jauf.1986.050 VL - 12 IS - 9 AU - P. Arron Geoffrey Y1 - 1986/09/01 UR - http://auf.isa-arbor.com/content/12/9/233.abstract N2 - A field study was initiated in 1985 to evaluate the growth retardation capabilities of potential plant growth regulators for silver maple. Twelve-year-old silver maple trees were trimmed and trunk injected with one of two application rates of EL-500 {alpha-(1-methylethyl)-alpha-[4-(tri-fluro-methoxy)phenyl]-5-pyri-midine-methanol} (common name: flurprimidol) and PP 333 {(2RS, 3RS)-1-(4-chlorophenyl)-4, 4-dimethyl-2-(1,2,4-triazol-1-yl)pentan-3-ol} (common name: paclobutrazol). The high (20 g/L and low (4 g/L) application rates of both EL-500 and PP 333 resulted in significantly shorter sprouts than in the two control groups when the sprouts that had formed on single-and multi-stemmed trees were considered collectively in the fall of 1985. Both growth regulators appeared to be more effective in single-rather than multi-stemmed trees and this may be related to an uneven distribution of chemical between the two or three stems of the latter. ER -