Disease Hotline Issue 4


Damage and symptoms of pine wilt nematode. Photo by: Robert Lambe, Virginia Polytechnic Institute and State University, Bugwood.org.

Close-up of damage, one year after tree death. Photo by: USDA Forest Service – Rocky Mountain Region Archive, USDA Forest Service, Bugwood.org.

Cerambycid (Longhorn) beetles transmit the nematode to susceptible trees. Photo by: L.D. Dwinell, USDA Forest Service, Bugwood.org.

Nematode in an axial resin canal of Pinus densiflora. Photo by: Y. Mamiya, Bugwood.org.

The nematodes also feed on blue stain fungi which often invade dead, dying, or fresh cut timeber. Photo by: USDA Forest Service – North Central Research Station Archive, USDA Forest Service, Bugwood.org.