Reasonable Management of Pest & Diseases and upcoming threats in Urban Trees, Henry Kuppen

Wednesday 22 November 2017

There are several pest and diseases threatening tree populations. Most of the time eradication is not possible due to the large extent of infection or infestation. However,
integrated pest and disease management (IPM) can offer opportunities to minimize the risk or even contain and control the threat. In this seminar the management of the following Pest & Diseases will be discussed:
Horse Chestnut Bleeding Cancer (Pseudomonas syringae pv aesculi) is recognized since 2000 as a bacterial pathogen. Since then many Aesculus have been cut down. Heat
treatment is a method to kill the bacteria.
The fungal disease, ash dieback (Hymenoscyphus fraxineus) having devastating effects on the ash population in the Netherlands. Ash dieback can pose a safety risk due to dead
branches or dieback of an entire tree. The development of asurvey- and management decision model will be discussed.
Platanus plays a major role in the urban environment. Massaria (Splanchnonema platani) is a typical disease which is exploited by several companies as a new earnings model.
Reasonable management of the risk of a falling branch seems to be the keyword when talking about Massaria.
Unfortunately Oak Processionary Moth (Thaumetopoea  processionae) was introduced in the UK in 2006. Fact is that  spreading of the insect seems to be unstoppable and
management of the risk for people’s health is the major goal.                                               What can we expect in the near future, what is knocking at Europa’s and UK’s border? A recent trip to Russia gave nsight in the impact of Emerald Ash Borer (Agrilus
planipennis). Xylella fastidiosa is since a couple of years located in important tree producing countries. Pineprocessionary moth is already in France, etc.
Pest and diseases belong to living creatures. This seminar is focussing on reasonable management if there is a need for management at all. A broad vision and opportunities that arise will form the conclusion.