Sudden Oak Death (Phytophthora ramorum) Quarantine Requirements

​​The Wisconsin Department of Agriculture, Trade and Consumer Protection has imposed an external quarantine on items that could carry Phytophthora ramorum, which causes sudden oak death and foliar symptoms on susceptible plant species. An external quarantine means that these items cannot be brought into Wisconsin from areas where it is known to exist. 

Areas Covered by the Quarantine

All areas listed in the Code of Federal Regulations (CFR) 

Quarantine and Regulations

Items Covered by the Quarantine

  • Nursery stock and unprocessed wood, plants and plant parts (including bark chips, firewood, logs, lumber, mulch, wreaths, garlands and greenery) from these genera:
    • Soil and potted media
    • Cultures and live material of P. ramorum
    • Any other items that a pest control official determines pose a risk and notifies you of that fact. 
For the list of federally regulated proven and associated P. ramorum hosts, please use this link:


You can bring the above items into Wisconsin if acc​ompanied by a certificate from an inspector where they originate, which states that:

  • They come from non-infested premises and have not been exposed to P. ramorum, or
  • They have been treated to destroy P. ramorum, with what, and when, or
  • That they were produced, stored, or handled under conditions that would preclude transmission of P. ramorum.

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