There is a high likelihood that P. gymnostoma will continue to spread in the UK and will eventually reach commerical premises. Economic damage would be expected on Allium crops, particularly leek and onion crops from autumn sowings. Measures to prevent the spread of P. gymnostoma from the West Midlands, e.g. to the Vale of Evesham, a major leek growing region of England, relatively close by, are likely to be difficult to implement.