A “convincing hypothesis”?
The BBC reports:
The researchers believe that the global trade in crops is mainly responsible for the movement of pests and pathogens from country to country.
However, the organisms can only take hold in new areas if the conditions are suitable, and the researchers believe that warming temperatures have enabled the creature to survive at higher latitudes.
Dr Bebber said: “The most convincing hypothesis is that global warming has caused this shift.
“One example is the Colorado potato beetle. Warming appears to have allowed it to move northwards through Europe to into Finland and Norway where the cold winters would normally knock the beetle back.”