Greenfly (also called aphids) are tiny, soft-bodied insects that cluster on new growth, buds, and stems. They are very common in UK gardens and can weaken plants by sucking sap.
How to Spot Greenfly
- Small green insects in clusters on shoots or buds
- Leaves curling or yellowing
- Sticky residue (honeydew) on leaves or surrounding surfaces
- Sooty mould may develop on the honeydew
Why They Appear
Greenfly thrive when plants are:
- Stressed or over-fertilized
- Growing quickly in warm, sheltered conditions
- Crowded with poor air circulation
What Helps
- Squash or brush off small infestations
- Water sprays can knock them off young plants
- Remove badly affected growth
- Keep plants healthy and well-spaced
Biological Control
Natural enemies can keep greenfly under control:
- Ladybirds (both adults and larvae)
- Lacewing larvae
- Parasitic wasps (Aphidius colemani)
These beneficial insects eat or parasitize greenfly without harming your plants, pets, or pollinators.
Top Tip
Check new growth weekly. Early action with hand removal or introducing predators keeps greenfly populations low and plants healthy.
