What is the role of the elm leaf beetle and root grafts?

The elm leaf beetle plays a significant role as a vector for Dutch Elm Disease, which is caused by a specific fungus (Ophiostoma ulmi) spread through the beetle’s activities. As the beetle feeds on the leaves of elm trees, it can inadvertently pick up spores of the fungus from infected trees. When the beetle moves to another tree, it can introduce these spores, leading to new infections. This process is critical in the spread of Dutch Elm Disease, which has had devastating impacts on elm populations. Understanding the relationship between the elm leaf beetle and Dutch Elm Disease is vital for managing and protecting elm trees from this serious threat.