Category Archives: Plant Gall Identification

Galls on Ferns, Bracken etc

Curled Bracken fronds The curled fronds on Bracken (Pteridium aquilinum) are caused by the tunneling larvae of the fly Chirosia grossicauda. Blackish swellings on Bracken fronds These dark swellings on the frons on Bracken are caused by the gall midge … Continue reading

Posted in Plant Gall Identification | Leave a comment

Galls on Nettle

Swellings on Common Nettle leaves These swellings on Common Nettle (Urtica dioica) are caused by gall midge Dasineura urticae. The swellings contain several midge larvae (occasionally one). The galls range in colour from pale green (as in the photo) to … Continue reading

Posted in Plant Gall Identification | Leave a comment

New Easy Reference System fo Plant Gall Identification

There is a new and easier way to try and identify plant galls using my blog. Galls are now categorised by host plant eg Oak. All you need to do is simply go to categories and click on Plant Gall Identification. You will … Continue reading

Posted in Plant Gall Identification | Leave a comment

Galls on Oak

Knopper gall This gall is caused by the asexual generation of the gall wasp Andricus quercuscalicis. The gall forms on the acorns and inside the knobbly structure is an egg shaped gall in which the wasp resides. Artichoke gall The … Continue reading

Posted in Plant Gall Identification | Leave a comment

Galls on Alder

Postules on leaves These galls are caused by the mite Eriophyes laevis. The mites live and feed inside the pouch-like galls which are hollow and there is a small opening on the underside. These galls are found spread over the whole … Continue reading

Posted in Plant Gall Identification | Leave a comment

Galls on Ash

Rolls on leaves A common psyllid or jumping plant louse, Psyllopsis fraxini causes these rolls in the leaves of an Ash tree (Fraxinus excelsior). Over-wintering eggs hatch in the early summer and the nymphs begin to feed on the leaf, … Continue reading

Posted in Plant Gall Identification | Leave a comment

Galls on Lime

Nail galls These projections occur on the leaves of Large-leaved Lime (Tilia platyphyllos) and the Common Lime tree (a hybrid between the Large-leaved Lime and the Small-leaved Lime). They house the gall mite Eriophyes tiliae. The galls range from 8-15mm … Continue reading

Posted in Plant Gall Identification | Leave a comment