Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

The population dynamics of the oriental scale insect, Aonidiella orientalis (Newstead) and factors affecting its seasonal abundance.

Abstract

Four distinct peaks, representing 4 annual generations (2 winter and 2 spring) were observed in populations of the diaspidid Aonidiella orientalis on Ficus nitida [F. benjamina] in Saudi Arabia in 1987-88. Populations were lowest in summer, probably due to very high temperatures and arid conditions. Temperatures (maximum and mean) were negatively and significantly correlated with populations, relative humidity was slightly positively correlated, and rainfall had no apparent effect. As a general rule, the sides of trees exposed to the wind harboured fewer individuals than the opposite sides.