Portugal is struggling to contain a new outbreak of nematodes, microscopic worm-like organisms that are killing wild pine trees and threaten to spread abroad despite drastic measures to stop their advance. The government cut a 430 km (265 mile) corridor through Portugal's southern forests last year to contain the Pine Wilt Nematode within a 1 million hectare (2.47 million acres) area, about one ninth of Portugal's forested land.