Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Effect of fruit fly sprays on the abundance of the citrus mealybug, Planococcus citri (Risso), and its predator, Cryptolaemus montrouzieri Mulsant, on passion-fruit in south-eastern Queensland.

Abstract

The effects are reported of 3 insecticidal treatments used against Dacus tryoni (Frogg.) on populations of Planococcus citri (Risso) and its main predator Cryptolaemus montrouzieri Muls. on passion fruit in south-eastern Queensland in 1975-76 [see also preceding abstract]. Only 0.03% dimethoate (as a cover spray applied fortnightly) was also effective against P. citri. Fortnightly sprays with 0.1% DDT against D. tryoni resulted in increased numbers of P. citri, because of the destruction of C. montrouzieri. Bait sprays with 0.55% malathion and 0.5% protein hydrolysate applied weekly to trellis posts that supported the vines appeared to have no appreciable effect on the mealybug or its predator.