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Infestations of eucalyptus gall wasp can spoil the appearance of the older foliage and may result in excessive leaf fall. This minute insect was first detected in Britain in 2005 and it has spread across southern England.
Eucalyptus gall wasp (Ophelimus maskelli) on Eucalyptus (Eucalyptus sp.). Credit: RHS/Entomology.
The eucalyptus gall wasp is a minute (<1mm) black insect whose larvae develop inside raised galls that form on eucalyptus leaves during spring.
The gall wasp does not affect the long term health or vigour of the tree, but can affect its appearance. Its presence must largely be tolerated and insecticides are unlikely to give good control.
Chemical labels explained
Chemicals: using a sprayer
Chemicals: using safely and effectively
Fuchsia gall mite
Oak gall wasps
RHS statement on pesticides in horticulture
Robin's pin cushion (rose bedeguar gall)
Wasps (social) including hornets
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