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. | |
Licence : | Droits gérés |
Crédit : | Science Photo Library / Jensen, Claus |
Model Release : | Non requis |
Property release : | Non requis |
Durée : | 22 Secondes |
Aspect ratio : | 16/9 |
Restrictions : | - |