Tilia cordata · Tree
Aphids (Greenfly): Encourage natural predators like ladybirds and lacewings, or wash off infestations with a strong jet of water.
Lime nail gall mite: No treatment is necessary as these galls are cosmetic and do not affect the tree's health or vigour.
Sooty mould: Control the underlying aphid infestation to remove the food source for the mould, which will then gradually wash away.
Horse chestnut scale: Scrape off visible scales by hand or apply a horticultural oil spray in winter when pests are dormant.
Phytophthora root rot: Ensure the tree is planted in moist but well-drained soil to prevent waterlogging which favours the pathogen.