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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.
Common name Eucalyptus gall waspScientific name Ophelimus species, possibly O. maskelliPlants affected EucalyptusMain symptoms Small, slightly raised swellings appear on the leaves in springMost active March-June
The 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.
Pesticides for gardeners (Adobe Acrobat pdf document outlining pesticides available to gardeners)
Chemical labels explained Chemicals: using a sprayer Chemicals: using safely and effectively EucalyptusEucalyptus: pruningFuchsia gall mite Gall mites Honey fungusOak gall waspsOedemaRHS statement on pesticides in horticulture Robin's pin cushion (rose bedeguar gall)Wasps (social) including hornets
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