What's eating my liquidambar styraciflua 'worplesdon'?

Liquidambar 'Worplesdon' shares the same pest profile as the species. Fall webworm is the most visually striking problem, encasing branch tips in silk tents in late summer. Scale insects and bagworms occur on stressed trees. This cultivar is vigorous and generally pest-resistant when planted in moist, well-drained soil with full sun.

Silken tents around branch tips in late summer; caterpillars defoliate inside the tent; cosmetically damaging on an ornamental specimen Prune and destroy tents early; Bt spray on exposed caterpillars; do not tear open tents while larvae are active

Armoured scale on bark of branches; yellowing foliage above; localised die-back on severely infested young wood Horticultural dormant oil in late winter; summer oil or insecticidal soap for crawler stage; systemic treatment for persistent infestations

Silk-and-foliage bags hanging from branches; caterpillars strip leaves; heavy years can cause significant canopy thinning Hand-remove and destroy overwintering bags; Bt or spinosad spray at bag-opening in early summer; inspect neighbouring conifers which act as reservoir hosts