Galls on elms caused by the aphid Tetraneura ulmi. The galls are abnormal growths of plant tissue caused by chemicals that the aphids inject. The galls provide protection and food for the developing aphid larvae. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Jensen, Claus |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Länge: | 22 Sekunden |
Seitenverhältnis: | 16:9 |
Restrictions: | - |