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

1

Box tree caterpillar

1

Honey fungus

2

Slugs and snails

2

Phytophthora root rots

3

Viburnum beetle

3

Pear rust

4

Vine weevil

4

Volutella blight of box

5

Woolly aphid

5

Verticillium wilt

6

Southern green shield bug

6

Blossom wilt of fruit trees

7

Fuchsia gall mite

7

Box blight

8=

Capsid bug

8=

Kerria twig and leaf blight

8=

Cushion scale

8=

Leaf spot and canker of Prunus

10

Ants

10

Powdery mildew of Prunus

“As the UK faces new plant health problems it’s imperative that the country has the skills needed to predict, exclude and manage the worst.” - Matthew Cromey, Principal Scientist at RHS

The RHS is conducting research into several of the most prevalent pests and diseases including the range of slug and snail species in the UK, controls for box tree caterpillar and box blight and improved strategies for managing honey fungus.

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