Mortality and Diameter Growth in Mountain Ash Defoliated by Phasmatids

Abstract

Mortality of mountain ash defoliated by phasmatids during 1960–61 and again in 1962–63 reached 83 per cent within two years of the second defoliation. For two years after the second defoliation, the surviving trees decreased in diameter; thereafter, positive increment was recorded but only for the least affected trees.