Nature itself took care of the ash-tree protection.
Ash emerald borer was first found in Russia in 2003 in Moscow. Since then, it has formed its invasive range, occupying the territory east to the Volga, west to Smolensk and south to Voronezh. In Moscow, about 10 years after the discovery, the entomophagous began to regulate its population and the death of the ash tree stopped. It was proposed to start work on the prevention of harm in the new regions, where the ash emerald borer penetrates, by creating conditions for increasing the number of its entomophages.