Use Of A Tree Growth Regulator To Manage Vegetation Near Overhead Power Lines

Abstract

The intent of this study was to determine if paclobutrazol could effectively reduce the growth rate of trees interfering with overhead power lines. American elm, hackberry, silver maple, post oak, and sycamore were observed on 250 different locations to determine the effect paclobutrazol had in reducing annual growth. The trees were located on five different soil types to gauge any discrepancies. Visual observations were made on all trees treated with paclobutrazol and compared to untreated trees of the same species on the same locations to determine annual growth reduction. Paclobutrazol was effective in reducing annual growth of all trees for up to three years after the treatment date. Trees treated within four months of observation did not show any response to paclobutrazol. Soil type did not affect branch growth of any species treated with paclobutrazol. Also, no direct relationship between tree diameter and growth reduction was apparent.