This is a relatively new problem and one we encountered last year for the first time, but like many people, we put it down to Box Blight. These pesky little critters completely decimate Buxus/Box. So it’s a good idea to start keeping an eye out on any Buxus/Box that you have in your garden.
What is Box Tree Caterpillar I hear you ask? Well…handily the RHS has all the info we need to help us stop the pests and save our precious Box!
“Box tree caterpillars are the larvae of a moth that feeds on box (Buxus) plants. It is native to East Asia and it became established in Europe in 2007. Although adult moths were first found in the UK in light traps in 2008, it was not until 2011 that larvae were reported in private gardens in the home counties. By the end of 2014 the moth had become established in parts of London and surrounding counties; in many cases the caterpillars had caused severe defoliation indicating that the moth is likely to become a serious problem.
Symptoms:
Gardeners are likely to become aware of box tree caterpillar when they find webbing and caterpillars on box plants.
The pale yellow flattish eggs are laid sheet-like, overlapping each other on the underside of box leaves.
Newly hatched caterpillars are greenish-yellow, with black heads. Older caterpillars reach up to 4cm (1¼in) in length and have a greenish/yellow body with thick black and thin white stripes along the length of the body.
The pupae are concealed in a cocoon of white webbing spun among leaves and twigs.
The adult moth usually has white wings with a faintly iridescent brown border, although the wings can be completely brown or clear. The moth has a wingspan of around 4cm (1¼in).
The caterpillars eat box leaves and produce webbing over their feeding area. Plants may also show patches of dieback which may be especially apparent on trimmed plants. This is not to be confused with dieback caused by the disease known as box blight.”
Article source:
https://www.rhs.org.uk/advice/profile?pid=760
Garden pests. Great fun, aren’t they?!
Written by David & Stu. Posted by Stu.