Potatoes had not been grown in that spot last year, so it would seem that the beetle had apparently spread from an area nearby, probably from the other side of the eastern border at the end of June/beginning of July.
Paikalla ei ole viljelty perunaa viime vuonna, joten kuoriainen on kulkeutunut nähtävästi lähiseudulta, todennäköisesti itärajan takaa kesä-heinäkuun vaihteessa.ParaCrawl Corpus ParaCrawl Corpus