Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Population studies of the citrus mealybug, Planococcus citri (Risso), and its natural enemies on passion-fruit in south-eastern Queensland.

Abstract

Field populations of Planococcus citri (Risso) and its natural enemies on passion fruit were sampled fortnightly in south-eastern Queensland from March 1974 to March 1976. Numbers of P. citri were lowest in September, increasing to peak populations in January-June; natural enemies were not effective against it. Cryptolaemus montrouzieri Muls. was the most abundant predator, with Harmonia octomaculata (F.) (Coccinella arcuata (F.)), Chrysopa sp. and Oligochrysa lutea (Wlk.) less common. Parasite activity was insignificant. Attack by a fungus similar to Entomophthora fumosa caused up to 58.1% mortality of third-instar nymphs and adults in a period of high rainfall and humidity in the wet season in January 1976.