Potato Cyst Nematode infestation is a major constraint on the British Potato industry and costs upwards of £25m each year, according to Rob Clayton, Strategy Director Potatoes at the Agriculture and Horticulture Development Board (AHDB). He says the make-up of the national PCN population in Britain is changing, and nematodes are moving into areas that they have not previously inhabited. In this video Mr Clayton outlines the extent and characteristics of the national PCN population in Britain. Further information can be requested from Rob Clayton at rob.clayton@ahdb.org.uk.