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Plate galler

describes plate galler wasp impact on western white gum

Raised, hard plate galls on western white gum leaves. Tiny, round wasp exit holes are visible.

affected western white gum leaves appear brown after severe damage from plate galler

Plate galler can cause severe damage in young western white gum plantations. The affected leaves appear brown.

General information

The plate galler is a tiny wasp that completes its life cycle in the leaf lamina of young western white gum. The feeding larvae induce the tree to produce plate-like gall tissue on the upper leaf surfaces. It is the most important, known pest of western white gum and can cause severe defoliation in young plantations.

Scientific name

Ophelimus species

Description

Raised, brown plate-like galls on the upper surface of leaves. The plate galls often form masses that can cover the leaf surface completely. Very small exit holes of adult wasps are sometimes seen on the gall surface.

Habitat/distribution

Primarily found in Queensland.

Host trees

Unique to western white gum (Eucalyptus argophloia).

Damage

Severe infestations can affect 100% of leaves, resulting in significant defoliation. Tree growth can be affected significantly for the first 1-3 years in plantations.

References

Last updated 15 October 2012