PACIFIC NORTHWEST NURSERY IPM
Detection of populations of the exotic snail Candidula
intersecta in Oregon
Since 2003, PPQ-Oregon has conducted detection surveys for exotic mollusk species at high-risk sites throughout Oregon. The Oregon Exotic Mollusk Survey (ORMS) has surveyed over 80 sites, representing 16 Oregon counties (Benton, Clackamas, Clatsop, Columbia, Coos, Curry, Douglas, Jackson, Klamath, Lane, Lincoln, Marion, Multnomah, Polk, Washington, Yamhill counties). Surveyed sites have included marine ports, rail yards, tile importers and distributors, nurseries, private residential and public lands.
The exotic snail Candidula intersecta has recently been detected at seven sites in southern Oregon, including four sites in Coos Bay (Coos County), and single sites in Frankport, Gold Beach and Port Orford. Morphological identification has been confirmed by the USDA regional and national malacologists. Candidula intersecta, or the wrinkled dune snail, is considered by the USDA to be a potential agricultural pest. All seven positive sites are located on the southern Oregon coast, at active or historical port sites. The density and range of the infestations at each site is currently unknown; however, preliminary estimates of the total infested area in Oregon is 142 acres, minimum. Follow-up delimitation survey will need to be conducted to provide further information. No state or federal quarantine or control activities have been initiated yet.
Candidula intersecta are frequently intercepted
at the Port of Portland on cargo containers from Italy, Colombia, and
Chile and are considered Actionable by PPQ (PIN-309 database;
D. Robinson, USDA). The species originates in northern Europe, but is
also naturalized in New Zealand and Australia, where it is commonly reported
in open, dry environments, including pastures (G. Barker 2002. Molluscs
as Crop Pests), and habitats such as coastal dunes, exposed limestone
outcrops, open scrub
at altitudes from 0 to 800masl. (G. Barker
1999. Fauna of New Zealand).
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