Speedwell Gall-fly; high dependencies | Nature Notes

For years I have been seeing fluffy heads on germander speedwell plants and I just assumed they had gone to seed. Imagine my surprise when browsing through my new book about plant galls to come across a photograph like mine. This is not germander speedwell gone to seed, it is the work of a gall fly, Jaapiella veronicae. Apparently, the fly attacks the shoot tips and causes the topmost pair of leaves to cling together to form a hairy pouch that then contains numerous fly larvae.
This fly only attacks germander speedwell and germander speedwell is a pretty common flower but is there not a real risk here for the fly? 



Read More ... Speedwell Gall-fly; high dependencies | Nature Notes

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