Leptocybe invasa

The majority of Eucalyptus species have been confirmed to be susceptible to L. invasa (Jorge et al., 2016). Among these, E. camaldulensis (var. camaldulensis and obtusa), E. grandis, E. robusta and E. tereticornis showed remarkably high susceptibility ... To date, the only susceptible species not belonging to the Eucalyptus genus is Corymbia polycarpa ...

[F]emales usually prefer newly developed leaves, where they lay their eggs in the midribs, petioles and parenchyma tissue of twigs. Usually eggs are laid in a lined group at a distance of 0.3-0.5 mm of each other ... Gall development consists of five stages, described in Mendel et al. (2004):

- First stage: ... a little spot of dead cells ... similar to a cork tissue .,.. A change in colour from green to pink or reddish usually occurs to the cells of midribs ... and the spherical shape of the gall starts to be visible ... usually 1-2 weeks after deposition ...
- Second [to fourth] stage[s]: ... galls ... attain the typical green bump-shape ... [then] lose their green colour, turning into a glossy reddish colour. [After this] galls lose their glossiness, turning into dull pink/dark red.
- Fifth stage: [adults emerge and g]all colours turn to light brown on the leaf or red-brown on the stems ...

First and second stages of L. invasa galls could be confused with early stages of Ophelimus maskelli galls, but while L. invasa makes bump-shaped galls on petioles, leaf midribs and young branches, O. maskelli induces blister-like galls on the leaf’s surface ... 

"Leptocybe invasa (blue gum chalcid)"