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Box tree caterpillar and Honey fungus remain at the top of the RHS pest and disease chart.
For the third year in a row the RHS Gardening Advisory Service received more enquiries about Box tree caterpillar than any other UK pest.
Honey fungus remained the most prominent garden disease - as it has done since 1995 - with more than a quarter of all disease reports and enquiries relating to honey fungus.
The annual ranking is a guide to new and growing areas of concern for gardeners while also acting as a record for scientists and the RHS to understand and reflect on changes in gardens across the country.
Top pests 2018
Top diseases 2018
Box tree caterpillar
Slugs and snails
Phytophthora root rots
Volutella blight of box
Southern green shield bug
Blossom wilt of fruit trees
Fuchsia gall mite
Kerria twig and leaf blight
Leaf spot and canker of Prunus
Powdery mildew of Prunus
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We're a UK charity established to share the best in gardening. We want to enrich everyone's life through plants, and make the UK a greener and more beautiful place.