The mean numbers of CSFB per plant by county are shown in Figure 2. The four counties from which the most infested samples were returned were: Hertfordshire, Cambridgeshire, Bedfordshire and Essex. These all had more than four larvae per plant on average with levels in Hertfordshire exceeding 5 per plant. Samples from Suffolk, Oxfordshire, North Yorkshire and Wiltshire contained more than two larvae per plant on average. The four counties for which emergency use authorisation for neonicotinoid seed treatments was granted were Hertfordshire, Cambridgeshire, Bedfordshire and Suffolk and these counties co-incide with all but one of the areas of highest infestation.