Scolytus multistriatus is a species of coleoptera insect of the family Curculionidae, subfamily Scolytinae. It is distributed throughout most of Europe, with the exception of northern Scandinavia, it reaches to Iran and Algeria, and has been introduced in the United States and Canada. It is a perforator, which feeds on elms (genus Ulmus), of which it is a very important pest, as well as vector of the grafiosis, the most serious disease of the elm.
The cold periods of the year pass in the form of a larva, pupating in the middle of spring. After about a week the adults emerge; These are dispersed and after locating an elm suitable (dead or weak), the females, begin the construction of maternal galleries. The males are polygamous, and after copulation they help the female for a while, but then they leave and seek to mate again. The females after finishing the laying of eggs die. The eggs take a week to open, and the larvae develop in a month.
In addition to the significant damage it causes as a perforator, its role as a vector in the propagation of grafiosis is key: to achieve sexual maturation, adults need to feed on healthy elms, which transport the spores of the fungus causing the grafiosis ( Ophiostoma) from sick trees to healthy trees, which in turn become sick when they become the proper place for food and reproduction of this scolitid.
In the Iberian Peninsula they can get to perform four complete biological cycles in a year.