Disease Hotline Issue 24

To the left is a picture of Giant Puff balls.  Photo provided by Joseph LaForest, University of Georgia, Bugwood.org.  Pictures of foliar nematodes have already been posted to the site.  Please use the search function to locate pictures of foliar nematodes, leaf spots, or mushrooms.

 

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.

What’s Hot HL Issue 23


Cercospora leafspot on rose. Photo by: Bob Mulrooney, Plant Pathologist, University of Delaware

Pyracantha scab on fruits. Photo by: Bob Mulrooney, Plant Pathologist, University of Delaware

Puss caterpillar. Photo by: Gerald J. Lenhard, , Bugwood.org

Puss caterpillar. Photo by: Lacy L. Hyche, Auburn University, Bugwood.org

Plumbago foliar nematode. Photo by: Bob Mulrooney, Plant Pathologist, University of Delaware

Disease Hotline Issue 20


Foliar nematode infesting hosta. Photo by: Bob Mulrooney, Plant Pathologist, University of Delaware

Foliar nematode infesting peony. Photo by: Bob Mulrooney, Plant Pathologist, University of Delaware

Plumbago foliar nematode. Photo by: Bob Mulrooney, Plant Pathologist, University of Delaware

Foliar nematodes infecting hosta. Photo found at:http://www.extension.umn.edu/yardandgarden/YGLNews/YGLNewsSept12007.html and taken by: Michelle Grabowski.

Sclerotium rolfsii (southern blight). Photo taken by: Nancy Gregory, University of Delaware Plant Diagnostician.

Disease Hotline Issue 23

Botrytis Stem Canker

Botrytis on Geranium (Pelargonium)
Above 2 Photos from New England Greenhouse Update

Foliar Nematodes Magnified

Photo by Jody Fetzer, New York Botanical Garden, Bugwood.org

Foliar Nematode Damage to Mums
Photo by Jody Fetzer, New York Botanical Garden, Bugwood.org

Foliar Nematode on Anemone
Photo by Jody Fetzer, New York Botanical Garden, Bugwood.org

Foliar Nematode on Butterfly Bush

Photo by Jody Fetzer, New York Botanical Garden, Bugwood.org

Foliar Nematodes on Ferns and Hostas

Photos by Bob Mulrooney, Extension Plant Pathologist, University of Delaware