Friday, May 28, 2010

Disease Hotline Issue 9


Dogwood anthracnose from a distance. Photo provided by: Robert L. Anderson, USDA Forest Service, Bugwood.org

Close-up of dogwood anthracnose. Photo provided by: Robert L. Anderson, USDA Forest Service, Bugwood.org

Azalea leaf gall. Photo provided by: Paul Bachi, University of Kentucky Research & Education Center, Bugwood.org

Azalea leaf gall. Photo provided by: Clemson University - USDA Cooperative Extension Slide Series, Bugwood.org

Weed Hotline Issue 9


White clover. Photo provided by: Chris Evans, River to River CWMA, Bugwood.org

What's Hot HL Issue 9


Cottony maple leaf scale. Photo taken by: Nancy Gregory, Plant Diagnostician, University of Delaware

Azalea lace bug. Photo taken by: Brian Kunkel, Ornamentals IPM Specialist, University of Delaware

Insect Hotline Issue 9


Bagworm feeding on hawthorn. Photo taken by: Brian Kunkel, Ornamentals IPM Specialist, University of Delaware

Bagworms feeding on Leyland cypress. Photo taken by: Brian Kunkel, Ornamentals IPM Specialist, University of Delaware

Friday, May 21, 2010

What's Hot HL Issue 8


Dutch elm disease. Photo provided by: William Jacobi, Colorado State University, Bugwood.org

Damage caused by hawthorn leaf miner. Photo provided by: Whitney Cranshaw, Colorado State University, Bugwood.org

Disease Hotline Issue 8


Coniothyrium bartholomaei on yucca looks similar to Mycosphaerella leaf spot. Photo is of C. bartholomaei. Photo found at: http://ipmnet.org/plant-disease/disease.cfm?RecordID=1160

Fruiting bodies (pycnidia) of C. bartholomaei on yucca are the black structures in center of the tan area. Photo found at: http://ipmnet.org/plant-disease/disease.cfm?RecordID=1160

Iris leaf spot on the plant. Photo provided by: R.K. Jones, North Carolina State University, Bugwood.org

Close-up of iris leaf spot. Photo provided by: R.K. Jones, North Carolina State University, Bugwood.org

Wilting caused by botryosphaeria canker on rhododendron. Photo found at: http://www.umassgreeninfo.org/fact_sheets/diseases/botryosphaeria_canker.pdf and taken by R. K. Jones, Diseases of Woody Ornamentals and Trees. APS Press

Insect Hotline Issue 8


Hemlock woolly adelgid infestation. Specks on needles are crawlers moving on needles. Photo provided by: Pennsylvania Department of Conservation and Natural Resources - Forestry Archive, Bugwood.org

Close-up of hemlock woolly adelgid eggs. Photo provided by: Shimat Joseph, University of Georgia, Bugwood.org

Injecting insecticide into the tree is one method to control HWA. Photo provided by: Great Smoky Mountains National Park Resource Management Archive, USDI National Park Service, Bugwood.org

Injecting systemic insecticides into the soil (using a Kioritz here) is another way to treat for HWA. Photo provided by: Great Smoky Mountains National Park Resource Management Archive, USDI National Park Service, Bugwood.org

Spraying insecticides in another method to control HWA. Photo provided by: Great Smoky Mountains National Park Resource Management Archive, USDI National Park Service, Bugwood.org

Friday, May 14, 2010

Disease Hotline Issue 7


Pine needle rust. Photo provided by: Bob Mulrooney, Plant Pathology Extension Specialist, University of Delaware

Anthracnose on ash. Photo provided by: Joseph O'Brien, USDA Forest Service, Bugwood.org

Close-up of anthracnose on ash tree leaves. Photo provided by: Joseph O'Brien, USDA Forest Service, Bugwood.org

Anthracnose on ash leaves. Photo provided by: Virginia Tech Learning Resources Center, Virginia Polytechnic Institute and State University, Bugwood.org

Phyllosticta leaf spot on a maple tree. Photo provided by: Joseph O'Brien, USDA Forest Service, Bugwood.org

Culture Hotline Issue 7


Tree mulched in the 'mulch volcano' style which is improper mulching. Photo provided by: Robert Benjamin, Bugwood.org

Tree improperly mulched. Photo provided by: Joseph LaForest, University of Georgia, Bugwood.org

Insect Hotline Issue 7


Euonymus scale crawlers (yellowish specks) on the underside of the leaf. Photo provided by: Daniel Herms, The Ohio State University, Bugwood.org

What's Hot HL Issue 7


Cottony maple leaf scale. The white cottony 'sacs' are filled with scale eggs. Photo found at: http://www.ces.ncsu.edu/depts/ent/notes/O&T/specificplants/note136/note136.html

Friday, May 7, 2010

What's Hot HL Issue 6


Hemlock woolly adelgid egg masses. Photo provided by: Brian Kunkel, Ornamentals IPM Extension Specialist, University of Delaware

Roseslug sawfly damage to a rose leaf. Photo provided by: Brian Kunkel, Ornamentals IPM Extension Specialist, University of Delaware

Roseslug sawfly larva feeding on rose leaf. Photo provided by: Brian Kunkel, Ornamentals IPM Extension Specialist, University of Delaware

Cedar apple rust. Photo provided by: Daniel H. Brown, USDA Forest Service, Bugwood.org

Cedar apple rust. Photo provided by: USDA Forest Service - Region 8 Archive, USDA Forest Service, Bugwood.org

Weed Hotline Issue 6


Japanese stiltgrass infestation. Photo provided by: Chris Evans, River to River CWMA, Bugwood.org

Japanese stiltgrass plant. Photo provided by: Ted Bodner, Southern Weed Science Society, Bugwood.org

Disease Hotline Issue 6


Black spot on rose. Photo provided by: Division of Plant Industry Archive, Florida Department of Agriculture and Consumer Services, Bugwood.org

Powdery mildew on dogwood. Photo found at: http://www.ca.uky.edu/agcollege/plantpathology/ext_files/PPFShtml/PPFS-OR-W-13.pdf

Insect Hotline Issue 6


Black vine weevil damage. Photo provided by: Jim Baker, North Carolina State University, Bugwood.org

Black vine weevil adult. Photo provided by: Joseph Berger, Bugwood.org

Black vine weevil larva. Photo provided by: Peggy Greb, USDA Agricultural Research Service, Bugwood.org