Monday, May 31, 2010
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
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