Box tree moth (Cydalima perspectalis) is a native of East Asia and was first reported in UK gardens in 2008. An important pest of box plants (Buxus spp.), larvae feed on leaves and in severe infestations can cause defoliation and dieback. Currently established in southern England, late-instar caterpillars produce webbing "tents" to protect themselves while feeding. Early detection and control are necessary because this webbing makes effective control difficult.
There are two-to-three generations produced per year, with the adult moths flying from May to October. The moth overwinters as a caterpillar in a silk cocoon between two leaves and begins feeding in early spring before pupating and emerging as the first adults in May.
The trap from Wiltshire-based Agralan allows monitoring between April and October, detecting when the adults are flying and so indicating when a suitable spray can be applied for effectiveness.