New Pest Response Guidelines - aphis - US Department of Agriculture

Pathways
Contaminated vehicles and or machinery with soil or plant fragments
infested with eggs and/or pupal cocoons from highly contaminated
forested areas.
Conveyances and containers: In ports close to forested areas, moths can be
attracted to the light from ships or cargo planes.
People: Any life-stage of the pine tree lappet can be transported by passengers
in personal equipment including clothing, tools and vehicles and/or in
baggage.
The known range of Dendrolimus spp. in Europe and Asia normally means that
this pest cannot get to the United States on its own through migratory patterns
or other natural means of spread. However, the Siberian silk moth appears to
have originated in Siberia but has been spreading westwards at a rate that has
been variously estimated from 12 km to 40 - 50 km per year with its most
western point at longitude 52° (Rozhkov, 1963). Although the SSM has been
detected on the European side of Russia, east of the Ural mountain range, it has
been suggested that future dispersal to most of Europe is difficult because of
the lack of suitable hosts (Mikkola and Stahls, 2008). This would indicate that
Some of the uncertainty in the past about the precise distribution of
Dendrolimus moths may derive from confusion among the species, especially
between Dendrolimus sibiricus and D. superans (Orlinskii, 2000).
12/2012-01 Dendrolimus Pine Moths 8-5