In field experiments in Scotland in 1969-74 for the control of Phyllocoptes gracilis (Nal.) on raspberry, many of the chemicals tested reduced the number of mites and the damage on raspberry leaves. However, counts of overwintering mites within the buds showed that only the systemic organophosphate vamidothion and the fungicide benomyl were effective compared with no treatment. Improvements in fruit yield and quality were observed in the year following treatment with vamidothion.