HL issue 9 2008

HL Issue 8 2008

HL Issue 7 2008

HL Issue 6 2008

HL Issue 5 2008

What's Hot HL Issue 9

Crabgrass. Photo by: Gordon Johnson, Extension Agent, Agriculture and Commercial Horticulture, University of Delaware, Kent County.

Dunce cap stage of bagworms. Bag is held upright by early instar bagworms and is called the 'dunce cap' stage. Photo by: Brian Kunkel, Ornamentals IPM Specialist, University of Delaware.



Calico scales. Photo by: Raymond Gill, California Department of Food and Agriculture, Bugwood.org.

Disease Hotline Issue 9

Pyracantha scab.


Red thread mycelium.

Red thread (Laetisaria). Disease photos by: Nancy Gregory, Plant Diagnostician, University of Delaware.

Insect Hotline Issue 9

Fletcher scale and eggs. Photo by: Tracy Wooten, Sussex County Extension Agent-Horticulture, University of Delaware.

Lecanium scale (Fletcher scale) on bald cypress. Photo by: Brian Kunkel, Ornamentals IPM Specialist, University of Delaware


Lecanium scale on oak. Photo by: Andrew J. Boone, South Carolina Forestry Commission, Bugwood.org.

Disease Hotline Issue 8

Both pictures above could be caused by Spiny witchhazel aphid or psyllids on river birch. Photos by: Nancy Gregory, Plant Diagnostician, University of Delaware.


Close-up of ash rust. Photo by: Nancy Gregory, Plant Diagnostician, University of Delaware.

What's Hot HL Issue 8

Woolly beech aphid infestation. Photo by: Brian Kunkel, Ornamentals IPM Specialist, University of Delaware.

Woolly beech aphids. Photo by: Brian Kunkel, Ornamentals IPM Specialist, University of Delaware.

Imported willow leaf beetle larvae. Photo by: Paul Weston, Cornell University, Bugwood.org.

Imported willow leaf beetle adults. Photo by: David Cappaert, Michigan State University, Bugwood.org.

Culture Hotline Issue 8

Salt damage on Taxus along sidewalk. Photo by: Joseph LaForest, University of Georgia, Bugwood.org.


Salt damage on a sugar maple. Photo found at: http://www.umass.edu/urbantree/factsheets/18roadsalttrees.html.

Insect Hotline Issue 8

Azalea bark scale. Photo by: Clemson University - USDA Cooperative Extension Slide Series, , Bugwood.org.




Azalea bark scale. Photo by: United States National Collection of Scale Insects Photographs Archive, USDA Agricultural Research Service, Bugwood.org.

Azalea leafminer. Photo by: Natasha Wright, Florida Department of Agriculture and Consumer Services, Bugwood.org.



Whitefly on azalea. Photo taken by: Brian Kunkel, Ornamentals IPM Specialist, University of Delaware.

Insect Hotline Issue 7

Redheaded pine sawfly. Photo by: G. Keith Douce, University of Georgia, Bugwood.org.


Redheaded pine sawfly pupae (cocoons). Photo by: Lacy L. Hyche, Auburn University, Bugwood.org.


Redheaded pine sawfly eggs. Photo by: Lacy L. Hyche, Auburn University, Bugwood.org.

Redheaded pine sawfly female. Photo by: Lacy L. Hyche, Auburn University, Bugwood.org.


Cercropia larva. Caterpillar with 5 prolegs. Photo found at www.wormspit.com/cercropia

Cercropia larva. Picture focuses on the crochets found on the prolegs.

European pine sawfly. Photo by: Petr Kapitola, State Phytosanitary Administration, Bugwood.org.

European pine sawfly. Photo by: Steven Katovich, USDA Forest Service, Bugwood.org.


European pine sawfly eggs. Photo by: Andrea Battisti, Università di Padova, Bugwood.org.

European pine sawfly male. Photo by: Louis-Michel Nageleisen, Département de la Santé des Forêts, Bugwood.org.

European pine sawfly female. Photo by: Louis-Michel Nageleisen, Département de la Santé des Forêts, Bugwood.org.

What's Hot HL Issue 6

Rizosphaera needlecast on Norway spruce.


Rizosphaera needlecast on Norway spruce, closeup. Rizosphaera photos by: Nancy Gregory, University of Delaware.


Woolly beech aphid. Photo by: Whitney Cranshaw, Colorado State University, Bugwood.org.

Heavy pine bark adelgid infestation. Photo by: USDA Forest Service - Northeastern Area Archive, USDA Forest Service, Bugwood.org.


Light infestation of pine bark adelgids. Photo by: Brian Kunkel, Ornamentals IPM Specialist, University of Delaware.

Boxwood leafminer adult and blistered leaf. Photo by: John A. Weidhass, Virginia Polytechnic Institute and State University, Bugwood.org.

Boxwood leafminer larvae. Photo by: Nancy Gregory, Plant Diagnostician, University of Delaware.