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Buprofezin: an effective and selective insect growth regulator against Unaspis citri (Hemiptera: Diaspididae) on citrus in south-east Queensland.

The insect growth regulator buprofezin was compared with currently used broad spectrum insecticides against 'Unaspis citri' (Comstock) in two trials in south-east Queensland. In the first trial, double applications of buprofezin and methidathion (both at 0.5 g a.i. L-1) eradicated the scale. Single applications resulted in 54.3 and 27.7% live adult female scale respectively after eight months. In the second trial double or triple applications of buprofezin (at 0.125, 0.25 and 0.5 g.a.i. L-1), compared well with methidathion and chlorpyrifos (both at 0.5 g a.i. L-1) resulting in less than 1% have adult female scale after four months. Buprofezin was non toxic to adult and juvenile stages of the parasitoids 'Aphytis Lingnanensis' Compere, and 'Leptomastix dactylopii' Howard. It also had no significant effect on adult 'Cryptolaemus montrouzieri' Mulsant, but reduced the number of late instar larvae completing development (in comparison with the untreated control) by up to 20%.