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.
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.