Insecticidal control of citrus gall wasp in Queensland

Trials were conducted with methidathion, monocrotophos and chlorpyrifos to evaluate their efficacy and timing against citrus gall wasp 'Bruchophagus fellis' Girault. Methidathion and monocrotophos both at 0.5 a.i. L-1 gave effective control with one application in early December. All chlorpyrifos treatments, and methidathion and monocrotophos applied in October or November before all of the citrus gall wasp eggs were hatched or in January after the twigs began to harden, were ineffective.