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Attacked trees are easily identifiable. The whole crown becomes progressively yellow, reddish and finally brown, and leaves then start to fall. This whole process takes a few weeks, especially for trees attacked during the spring by the first generation of the pest. Elms colonized at the end of the summer by the second generation show the dying symptoms starting from the next spring. Maturation feeding carried out on elm twigs causes minor damage characteristic of all Scolytus species but not easy to check.
Control strategies are aimed at reducing the population density of S. scolytus below an economic threshold. Several control methods can be listed. The action, advantages and restrictions of the various methods are discussed in the following sections.
Due to the variable regulations around (de-)registration of pesticides, we are for the moment not including any specific chemical control recommendations. For further information, we recommend you visit the following resources:
In the twentieth century the association between Dutch Elm Disease and elm bark beetles (including S. scolytus) caused the disappearance of elms in almost all European towns. In addition, wood attacked by scolytids and colonized by the fungus loses its mechanical, physical and aesthetic characteristics, with serious consequences for commercialization. In this respect, S. scolytus causes both tree death and wood loss.