R.A. BRAY and T.D. WOODROFFE

Division of Tropical Crops and Pastures, CSIRO, Brisbane, Queensland, Australia

Abstract

The effect of the leucaena psyllid was measured by comparing yields of plots sprayed with insecticide with those of control plots at Samford, in southeast Queensland. Over four harvests, covering a range of temperature and rainfall regimes, psyllids reduced the yield of edible material by 52%, and yield of stem by 79%. Psyllid infestation had a residual effect by subsequently reducing yield even when psyllids were not present.