Pest identification
What's eating my sorbus aria?
Aphids (rowan aphid Dysaphis sorbi and related spp.)
Signs: Tightly curled, distorted leaves on new shoots; sticky honeydew and sooty mold
Control: Prune out infested shoot tips; spray with insecticidal soap or pyrethrin; encourage natural predators
Fireblight (Erwinia amylovora — insect-vectored)
Signs: Shoot tips wilt and turn brown/black as if scorched; cankers ooze in wet weather
Control: Cut back to clean wood 60 cm below infection; sterilize tools between cuts; avoid high-nitrogen feeding
Pear and cherry sawfly (Caliroa cerasi)
Signs: Slimy slug-like larvae skeletonize leaf surfaces, leaving brown papery patches
Control: Knock larvae off with water jet; dust leaves with kaolin clay; spray with pyrethrin if severe
Birds (fieldfares, redwings, starlings)
Signs: Berries removed rapidly as they ripen in autumn
Control: Netting is impractical on mature trees; accept wildlife value or harvest early for jellies
Keep sorbus aria pest-free
Healthy plants resist pests best. Get the basics right:
Sorbus aria pests — FAQ
What is eating my sorbus aria?
Sorbus aria (whitebeam) is most seriously troubled by aphids on young growth and fireblight bacteria vectored by insects. Sawfly larvae can defoliate branches, and birds strip berries quickly. Watch for fireblight cankers and remove them promptly — the bacterial infection is the most damaging long-term threat.
How do I get rid of aphids (rowan aphid dysaphis sorbi and related spp.) on sorbus aria?
Tightly curled, distorted leaves on new shoots; sticky honeydew and sooty mold Prune out infested shoot tips; spray with insecticidal soap or pyrethrin; encourage natural predators
How do I get rid of fireblight (erwinia amylovora — insect-vectored) on sorbus aria?
Shoot tips wilt and turn brown/black as if scorched; cankers ooze in wet weather Cut back to clean wood 60 cm below infection; sterilize tools between cuts; avoid high-nitrogen feeding
How do I get rid of pear and cherry sawfly (caliroa cerasi) on sorbus aria?
Slimy slug-like larvae skeletonize leaf surfaces, leaving brown papery patches Knock larvae off with water jet; dust leaves with kaolin clay; spray with pyrethrin if severe
How do I get rid of birds (fieldfares, redwings, starlings) on sorbus aria?
Berries removed rapidly as they ripen in autumn Netting is impractical on mature trees; accept wildlife value or harvest early for jellies