Pruning Apple Trees and Woody Plant Control

Pruning trees–especially apple trees–is recommended between January and March each year to avoid potential disease and insect problems during the summer months. This winter period is also an excellent time to control unwanted or invasive woody trees and shrubs such as buckthorn, Siberian elm, Japanese barberry, and oriental bittersweet. Pruning Apple Trees For pruning apple trees, you want to prune […]

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Pruning: What, Why, When, and How

by Eric North, Research Fellow, University of Minnesota Department of Forest Resources   What is pruning? One of the most frequent questions I am asked with regard to tree care is: “When should I prune my tree?” While I think people are actually asking what time of year they should prune their tree, it might be better to start with […]

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Diseases and Insect Pests of Conifers (Evergreen trees) – by species

Douglas-Fir (Pseudotsuga): Armillaria Root Disease USFS Armillaria Root Rot Christmas Tree Pest Manual (USFS) Disease Management Recommendations for Trees and Shrubs (Swiss Needlecast) Dwarfmistletoe of Douglas-fir Insecticide Suggestions to Manage Landscape Tree and Shrub Insects HOW to Identify and Control Rhabdocline and Swiss Needlecasts of Douglas-Fir (USFS) Fir (Abies): Armillaria Root Disease USFS Armillaria Root Rot Christmas Tree Pest Manual […]

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Diseases and Insect Pests of Hardwoods (Broadleaf trees) – by species

Apple/Crabapple (Malus): Aphids on Deciduous Trees and Shrubs Apple Maggot Management Apple Scab Disease Management Recommendations for Trees and Shrubs (Black Rot Canker, Cedar-Apple Rust, Fireblight, Frog-eye Leaf Spot, Powdery Mildew, and Apple Scab) Fireblight Forest Tent Caterpillars in Minnesota Forest Tent Caterpillar (USFS) Gypsy Moth (USFS) Gypsy Moth in Minnesota (MNDNR) Insecticide Suggestions to Manage Landscape Tree and Shrub […]

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52nd Annual Minnesota Shade Tree Short Course 2014

52nd Annual Minnesota Shade Tree Short Course March 18-19, 2014 Bethel University, Arden Hills   Register Online Now   The 2014 Minnesota Shade Tree Short Course: It’s about Preservation. “Preservation,” incites thoughts of protecting trees from the wrath of construction and development projects. The 2014 Minnesota Shade Tree Short Course will expand on preservation to include not only saving those […]

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Emerald ash borer and your Minnesota woodlands: Management guidelines

Ash management guide for private forest owners  (PDF, 10.5MB plus a single page foldout) is a new resource for family woodland owners in Minnesota who have ash trees on their land. This guide book is a thorough overview of the ash resource in Minnesota including: ash’s history on the landscape; ash tree identification; information on the emerald ash borer (EAB); […]

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Tree Stem Protection

Benjamin K. Cooper, Undergraduate Research Assistant * Gary R. Johnson, Associate Professor, Urban and Community Forestry * Tree stem protection, commonly referred to as tree wraps, can serve two basic functions: stem protection from physical (mechanical) damage and modify the stem’s ambient environment. Physical or mechanical protection may protect the stem from equipment, animal, vandalism and herbicide damage. The stem-ambient […]

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How Much Does it Cost to Water This Tree?

View as a PDF: How Much Does it Cost to Water this Tree? By: Adam Flett, Department of Forest Resources Extension and Outreach, University of Minnesota Technical Advisors: Gary Johnson, Department of Forest Resources and John Lamb, Department of Soil, Water and Climate Water is a biological necessity for all trees, whether in a landscape or woodland setting and must […]

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Summary of storm damage to urban trees in Minnesota

Data Collection Forty-two (42) tree species were documented as damaged by wind and/or ice loading events in Minnesota between March, 1995, and October, 2005.   One thousand five hundred eighty-four (1584) individual sample units (damaged trees) were examined and the following data was collected from each sample unit: date damaged location (community/address) siting (lawn, blvd., etc) species size type of storm* […]

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Minnesota Tree Inspector Program

The Minnesota Certified Tree Inspector program has a new website:  http://www.mntreeinspector.com/ The MN Certified Tree Inspector program was implemented in 1974 in response to Dutch elm disease and oak wilt. Since then, hundreds of communities, municipalities, and private tree care companies have staffed more than 800 certified tree inspectors in Minnesota. It is now administered by the Department of Natural […]

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