In Slovenia, X. crassiusculus was found casually in traps during a survey for early detection of the walnut twig beetle,Pityophthorus juglandis Blackman. On 1 August 2017, 117 reddish-brown beetles were caught in a trap in Podsabotin. Shortly after two beetles were foundalso in the sample collected from Prvačina. Herewith Slovenia is the fourth European country

Although in the Valencia region in 2017 no notifications of  Xylosandrus crassiusculus occurred, the inventory carried out during July-October 2018 confirmed that beetles are present in 12 Carob trees distributed in an area of 60 ha surrounding the 2016 outbreak. They were quit difficult to detect, because no  foliar symtoms on canopy are evident, and