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Box Tree Caterpillar

RHS Reveals Its Ranking For ‘Pests And Diseases Rife In UK Gardens’

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On Friday 2nd March, the RHS revealed it’s rankings for the pests and deseases most affecting UK gardens and no surprise for any box lover – Box Tree Caterpillar was top.

The list is in its 22nd year and it provides an annual ranking of new and growing areas of concern for gardeners and includes a number of pests and diseases first identified by the RHS, such as kerria twig and leaf blight that features in the top ten for the first time this year.


Pest 2017
1 Box tree caterpillar
2 Fuchsia gall mite
3 Vine weevil
4 Slugs and snails
5 Alder leaf beetle
6 Viburnum beetle
7 Tortrix moth
8 Glasshouse mealybug Pear blister mite
9 Blossom wilt of fruit trees
10 Woolly aphid

Disease 2017
1 Honey fungus
2 Phytophthora root rots
3 Rusts
4 Powdery mildews
5 Box blight
6 Volutella blight of box
7 Leaf spot and canker of Prunus
8 Verticillium wilt
10 Kerria twig and leaf blight

In 2017, box tree caterpillar returned to the number one spot after dropping to number seven in 2016. As EBTS UK members and friends know oly to well it is increasingly common in London and the Home Counties where the caterpillar feeds veraciously on the leaves of box causing serious defoliation.

In what was a bad year for the plant, it also battled box blight and volutella blight – both of which cause twig and leaf death. While the box tree caterpillar is expected to continue its spread, the potentially good news is that blight may be decreased by growing gardener awareness of how to manage it and breeding of resistant varieties.

EBTS UK will soon be releasing a Box Moth & Caterpillar early warning tracking map. You will be able to see what is happening in your area and we’ll be asking you to contribute your own observations to help enhance the map.

Keep an eye out for the announcement coming soon.

Box Tree Caterpillar 
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By |2019-01-30T13:39:27+00:00March 26th, 2018|Categories: Hedging & Topiary, Horticulture|Tags: , , |Comments Off on Box Tree Caterpillar

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