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Species: Milax gigates

Common name: Greenhouse slug
Family: Milacidae 

Dorsal image of Milax gigates
Supposedly sensitive to frost, their underground foraging behavior may offer some protection. Western Oregon’s mild winters may allow them to persist in field situations for long periods.
Origin: Europe
Diet: Plant material. Can be a pest of root crops and seedlings.
Behavior: Commonly subterranean. Reported as an important greenhouse pest in Oregon in the 1940s.
Where in Oregon: Apparently widespread in western Oregon with a spotty distribution associated with sheltered environments such as greenhouses.
Similar exotics to look for: There are at possibly 12 more species of Milax in Europe, but another genus, Tandonia, is of more concern. Tandonia species will usually have a distinct pale stripe along the tail (keel) and dark pigmented areas. Possible Tandonia should be reported to ODA.
Lateral image of Milax gigates. Adult size ranges from 45 to 70 millimeters
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