Betula pubescens · Tree
Honey fungus: Improve drainage and avoid planting susceptible species nearby; infected trees are difficult to cure.
Birch leaf miner: Rake up fallen leaves in autumn to reduce overwintering populations; severe cases may require systemic insecticide.
Powdery mildew: Ensure good air circulation and avoid overhead watering; treat with a suitable fungicide if severe.
Birch borers: Maintain tree health through proper watering and mulching; prune out infested branches promptly.
Aphids: Encourage natural predators like ladybirds or spray with insecticidal soap for heavy infestations.