TREES

Care

Deciduous: Basic Pruning Methods - PSU Solution Source (7001)

Deciduous: Planting Care for New Plants - PSU Solution Source (7004)

Pruning Ornamental Trees and Shrubs - Purdue U, Landscape Horticulture; In-depth, sketches, tools, when to prune particular plants.

Repairing a Wounded Tree Trunk - VA Tech, VA Cooperative Extension, VA State U. Brief, excellent photos.

Tree Care Information - ISA: International Society of Arboriculture. 

 

Diagnostics

Deciduous - Plant Doctor, detailed photos with name of problem.

Evergreen - Plant Doctor, detailed photos with name of problem.

Plant Pathology Fact Sheets - PSU; Woody Ornamentals; Full text, some photos.

Insects and Mites - PSU Dept of Entomology, Woody Ornamental Insect, Mite, and Disease Management.

Seven Common Diseases of Landscape Trees - PSU College of Agricultural Sciences; Dutch Elm Disease, Oak Wilt, Anthracnose, Maple Decline, Verticillium Wilt, Fire Blight. Photos, treatment.

Woody Ornamental IPM – PSU Southwestern IPM; some photos/text for specific insects; click on fact sheets or diagnosis to view index.

Iron Chlorosis - OSU HYG-1009-88

Needlecast Diseases - PSU Fact Sheet

 

Book Reference - Diseases of Trees and Shrubs, Wayne A. Sinclair and Howard H. Lyon, Cornell U. Press.

 

Insects

ID photos, fact sheets - forestpests.org U of GA with USDA

Woody Ornamentals Guide – PSU, insects, mites, diseases

Woody Ornamental IPM – PSU; excellent photos/text, fact sheets, diagnosis

Book Reference - Insects That Feed on Trees and Shrubs, Warren T. Johnson, Howard H. Lyon, Cornell U. Press.

 

Sources

Seeds

Angelgrove Tree Seed Co., Harbour Grove, NL, Canada

Saplings

Go Native Tree Farms - Lancaster, PA

Musser Forests – Indiana, PA

 

Search Engines

ISAO – International Society of Arboriculture Ontario. Scroll past Sponsored Results to Site Results. Search for specific problem such as "black twig tip".

              Nursery & Landscape Pests of Ontairo 

Online Tree Fact Sheets by Dendrology at Virginia Tech. Excellent photos/information on trees and shrubs.  Enter common or botanical name or use Family names listed at site and click PA state option. Once you click on Display Matching Species be sure to scroll entire page to see all info and further info options.

 

UConn Plant Database - U of Conn. Trees, shrubs, and vines. Search by name or attributes. Includes audible pronunciation.

 

What tree is this? OPLIN Simple ID by leaf and fruit; OH Public Library Information Network.

 

SEARCH ENGINES page.

 

Specific Trees

Black Walnut

Juglans nigra

Black Walnut Toxicity - HO-193-W; Purdue U. Cooperative Extension by Michael N. Dana and B. Rosie Lerner. Please avoid using any invasive plants mentioned in the article.

Native Plants for Beneath or Near Black Walnut Trees - Bowman Hill's Wildflower Preserve.

 

Dogwood

Cornus

Leaf roll/scorch – Washington State University – 5/07

Borer - Plant Doctor - Jeff Mizer, PSU Snyder County Extension; photo only, VA Tech - photo & text.

 

Fruit Trees

Fruit Production for the Home Gardener – PSU; available for purchase.

Home Orchard Calendar – PSU, adapted from U of West VA; colorful week by week maintenance for fruit trees. Hard copy in notebook.

Mid Atlantic Berry Guide - spiral notebook produced Nov 2007 by PSU, VA Tech, Rutgers U., U of DE, UMD, WVAU. For commercial growers but info useful for homeowners; will soon be available for purchase and possibly online. Notebook in Ext. office.

Tree Fruit Production Guide 2006/2007 - PSU

 

Golden Raintree 

Koelreuteria paniculata

Botryospaeria canker. Per PSU Plant Disease Clinic this fungus tends to invade tree and woody ornamentals that have been weakened by drought stress. There is no chemical control. Read the Plant Disease Facts article for detailed photos and further info.

 

Maples

Acer

Maple Diseases - PSU Plant Disease Facts; text/photos; disease,symptoms, pathogen, management in chart form; 5 pages. 

Seven Common Diseases of Landscape Trees - PSU College of Agricultural Sciences; Dutch Elm Disease, Oak Wilt, Anthracnose, Maple Decline, Verticillium Wilt, Fire Blight. Photos, treatment.

 

Oaks

Quercus

Oak Wilt - How To Identify, Prevent, and Control Oak Wilt, USDA, detailed, sketches. Oak Wilt, PSU Dept. of Plant Pathology Plant Disease Fact Sheet. Red oaks especially susceptible.

Sudden Oak Death Phytophthora ramorum- U of MD HGIC, USDA Fact Sheet. First noted in CA in 1995; Fungal-like organism whose spores spread by the wind from plant foliage and twigs. Hosts on the east coast that are killed by this disease include oaks and Douglas fir. Pieris, lilac, rhododendron and azalea, camellia, viburnum and others can serve as a source of disease spores.

Book Reference - Diseases of Trees and Shrubs, Wayne A. Sinclair and Howard H. Lyon, Cornell U. Press.

 

Pin Oak

Quercus palustris

Quercus palustris - OSU Pocket Gardener.

Iron chlorosis - OSU Fact Sheet HYG-1009-88.

 

Sycamore

Platanus occidentalis

Sycamore Disease Fact Sheets - Cornell U.

 

White Pine

Pinus strobus

Bagworm - PSU Entomological Notes; excellent photos.

Bagworm - UMN Entomology, Pests of Trees and Shrubs, excellent photos.

Bagworms - NCSU Dept of Entomology Insect Note, Ornamentals and Turf; brief, includes insecticide recommendations.

 

Spruce

Fallen Shoots – Fallen Shoots Under Mature Spruce Trees, Ontario Arborist, May 2006 

Needlecast - Rhizosphaera Needlecast on Spruce - Ohio State U Fact Sheet.

 

Specific Diseases

Anthracnose

Anthracnose of Trees and Shrubs - Cornell U Plant Disease Diagnostic Clinic Fact Sheet; color photos leaf/limb, disease cycle, management.

 

Sudden Oak Death Phytophthora ramorum

Sudden Oak Death -  U of MD HGIC, USDA Fact Sheet, Causal agent first identified in 1993 in Germany and The Netherlands on ornamental rhododendrons. Hosts on the east coast that are killed by this disease include oaks and Douglas fir. Pieris, lilac, rhododendron and azalea, camellia, viburnum and others can serve as a source of disease spores.

 

 Questions???? Call your Garden Hotline