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Boxwood Blight (Cylindrocladium pseudonaviculatum)

   
 

First identified in the United Kingdom in the mid-1990’s, it has also been confirmed from New Zealand and across Europe. The first detection in the U.S. occurred late fall 2011, with detections in North Carolina, Connecticut, and Virginia. Since those initial detections, this disease has been found in boxwoods at other locations as well. The Division of Plant Industry participated in a trace forward of boxwoods recently shipped to the state from a nursery in an infested county in Connecticut and did not find evidence of boxwood blight. The nursery industry and customers growing boxwoods should, however, be aware of and on the look out for this new disease. Please see Boxwood blight information sheet for more information on symptoms, life history, susceptible hosts, and suggested management of this disease. Please contact the Division if you believe you have nursery stock or landscape boxwoods infested with boxwood blight.

   
 

 

Boxwood blight has been detected in the following counties:

  • Connecticut – Fairfield, Hartford, Middlesex, New London and Windham
  • Massachusetts – Barnstable, Middlesex, Plymouth, Worcester
  • Pennsylvania – Lancaster
  • Rhode Island – Kent, Providence
  • New York – Westchester
  • Maryland – Prince George’s County
  • Virginia - Carroll
  • North Carolina - Surry
  • Oregon - Washington
boxwood blight

You can submit plant samples for identification of boxwood blight to the University of New Hampshire Plant Diagnostic Lab, for a fee of $20 per sample. UNH Cooperative Extension Plant Pathologist Cheryl Smith asks that you please call her at 603-862-3841 for sampling instructions and to let her know they are sending samples. Samples should be either brought in or shipped overnight via Fed Ex or UPS. The PDF of the lab sample form is also available on the website.

Visit the Contact Us page for Plant Industry contact information.

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New Hampshire Department of Agriculture, Markets & Food
25 Capitol Street, 2nd Floor
Concord, NH 03302
 
Copyright (c) State of New Hampshire, 2005