Our results showed that there was a continuous capture ofP. xylostella moths on an isolated island in the center of the Bohai Strait during 2003e2013, and the large number of catches took place separately in 2005, 2010, 2011, 2012 and 2013.
No P. xylostella larvae were found on the island where the light trap was located. Thus, the trapped P. xylostella moths must have been migrants