DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Nettle leaf gall, artwork. Three views of a leaf gall (red) on a stinging nettle leaf (Urtica dioica). The gall is caused by the parasitic larva of the nettle gall midge (Dasineura urticae). The larva is seen in the cross-section at bottom. The larva emits a chemical which stimulates growth and feeds on the juices and tissue produced inside the gall cavity. A slit in the top of the gall (red) provides an exit point.
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