Abstract
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-fluromethoxy) 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.
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