| 0454016 |
Dutch elm disease |
Ophiostoma ulmi |
Elm tree severely attacked by Ophiostoma ulmi in late summer, showing a range of foliar symptoms. |
| 0656081 |
bacterial canker of poplar |
Xanthomonas populi |
Canker, girdling stem of a highly susceptible Populus tremula tree. |
| 0176085 |
large elm beetle |
Scolytus scolytus |
in the lower surface of elm bark |
| 0176086 |
large elm beetle |
Scolytus scolytus |
Feeding grooves in crotch of elm twig |
| 0454001 |
bacterial canker of poplar |
Xanthomonas populi |
Leaf scar canker caused by Xanthomonas populi on young stem of poplar. |
| 0454017 |
Dutch elm disease |
Ophiostoma ulmi |
Cross section of an Ophiostoma ulmi-infected elm branch, showing characteristic dark spots in the wood. |
| 0176077 |
Dutch elm disease |
Ophiostoma ulmi |
Elm shoots variously attacked by Dutch elm disease (Ophiostoma ulmi); note yellowing and browning of foliage and formation of crozier-like hooks at twig ends. |
| 0176087 |
large elm beetle |
Scolytus scolytus |
Close up of feeding grooves in bark, and adults |
