Significant numbers of the Common House Moth (Tineola bisselliella) were first reported in the House in early 2008 and preventative treatment has been undertaken since then. In order to minimise the use of pesticides and the consequent risk of exposure to potential toxicants, a process involving moth pheromone has been employed.
Monitoring of moth activity shows that moth numbers within the House of Commons estate are generally reducing. However, activity in T block remains an issue and alternative methods of eradication are being considered. Measures are likely to involve spraying within offices and heat treatment of items contained in them in order to kill larvae. Members with offices in areas affected will be consulted in due course.