What's eating my sorbus 'joseph rock'?

Sorbus 'Joseph Rock' is most commonly attacked by aphids on spring growth and by fireblight, which can be lethal if left unchecked. Its long-lasting yellow berries attract birds from autumn into winter. Sawfly larvae and caterpillars can cause localised defoliation but rarely threaten the tree's overall health.

Curled, sticky leaves on new growth; honeydew drips onto lower leaves promoting sooty mold Encourage ladybirds and hoverflies; spray with insecticidal soap; prune congested shoot tips to improve air circulation

Blossoms wilt and brown in spring; shoots die back with characteristic shepherd's-crook bend; cankers form on branches Prune infected material at least 60 cm into healthy wood; disinfect tools with 70% alcohol; report significant outbreaks (notifiable in some regions)

Leaves rolled or tied with silk webbing; holes and ragged edges on spring foliage Apply grease bands in October; use Bt spray when caterpillars are small; remove silk-tied leaves by hand

Persistent berries stripped during winter irruptions Generally desirable wildlife; net only if berries are being harvested