The emerald ash borer (Agrilus planipennis Fairmaire; EAB) was introduced to Moscow, from where it began active radialspreading since the mid-2000s outbreak, advancing in the northern directions much less than in the southern ones. Agrilus planipennis is able to spread both by fl ight and by hitchhiking covering long distances directly on vehicles or with transported goods. The EAB distributes by fl ight, and the presence and abundance of host plants (ash trees) along its dispersal route play an important role in this process. Although A. planipennis was fi rst recorded in St. Petersburg in 2020, it got there probably by hitchhiking. The EAB could hardly have reached the city by its own, since there are no continuous ash stands in largest part of the area between Moscow and St. Petersburg. There is also no suffi cient food resource (ash trees) along the M10 Highway, linking these cities, the ashes and their stands are scanty and separated by long distances. Knowing the distribution pattern of the food resources along the A. planipennis supposed fl ight path, it is possible to draw conclusions about the prospects for its movement in one direction or another, make distribution forecasts, and, in some cases, prevent the local advancement of A. planipennis making gaps in the stands of host plants, for example, in roadside plantings.