The Oak Processionary (Thaumetopoea processionea)

We provide recommendations for Tree Officers and others who manage trees and woodlands in London, to help them formulate search and treatment plans and to understand the background to this serious pest.

The area affected by OPM is growing steadily. It seems possible that attempts to eradicate the pest may fail. Our Guidance Note also describes the reasons why, despite the hard work and effort put in by many organisations and individuals, we may be on the brink of failure.

At present this is generally considered as an issue of plant health. Should eradication fail and the pest continue to spread, the LTOA believes that the human health problem will belatedly have to be recognised at considerable potential cost.

At present, eradication may still be possible. The time to deal with the pest is now.

Dave Lofthouse, Chair of the LTOA, said “We are providing our members with the best tool we can devise to help them plan front-line action but resources will be the other key to success".

Click here to view or download the OPM Guidance Note from our document repository


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How to Become a Member

Members can attend, for free, the LTOA meetings which are held four times a year and cover a wide range of tree related matters.

Click here to find out how to become an associate member