Science News

May 2008

Oak Processionary Moth Statement

The Oak Processionary Moth, which has adverse health effects on trees and humans, first appeared in south west London in 2006. After nests were found at Kew Gardens in 2006, staff at RBG Kew began working closely with the Forestry Commission, Environmental Health Agency, Defra, Forest Research and local organisations to monitor the situation and work together to tackle the problem. Last year, 45 trees were affected on the Kew Gardens site and all nests were disposed of.

Since the start of the new season in 2008, a monitoring programme has been underway at Kew Gardens. Currently we are aware of four trees that are affected. It is early in the season and we are working closely with the Forestry Commission to manage any infestations and work towards eradicating this pest.

Caterpillars of the Oak Processionary Moth have short hairs that contain toxins and can be an irritant to lungs, eyes and skin, and in some cases have caused severe allergic reactions. Caterpillars begin to appear from the end of April with adults emerging between late July and September.

The Oak Processionary Moth's natural range is the Mediterranean regions of Europe. However, in recent years, its range has extended northwards, possibly as a result of climate change. It is now well established in Holland, Belgium and Germany. In parts of Europe, forests are closed during summer and early autumn. It is believed that eggs of the caterpillar arrived in Britain on trees imported from mainland Europe.

For further information, please see the Forestry Commission website at: http://www.forestry.gov.uk

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