Box Tree Caterpillar
Recent sightings of Box Tree caterpillars in Normandy is a timely reminder to be on the lookout for these small but voracious pests that can defoliate box hedges and topiary in a matter of just a few days. Plants will eventually recover and should not be removed, but attacks are unsightly and will weaken plants. Photograph from ebts.org The caterpillars are the larval stages of the Asian Box-Tree Moth ( Cydalima perspectalis ) accidently introduced into Kent in 2007. There can be three generations of caterpillars and adult moths in a season from March to October, so their spread from Kent has been rapid and relentless. Photograph from ebts.org Various pesticides, both organic and synthetic can be effective, but repeated applications may be necessary and as caterpillars usually produce silk webbing over their feeding area, contact spraying can be made more challenging by the need to penetrate this protective web. Biological control by spraying foliage with strains o...