Dealing with storm-damaged trees and woods

Windstorms can cause serious damage and destruction in Minnesota forests.  The storms in early July 2012 caused extensive damage in both urban forests and rural forests and woodlots.  We’ve pulled together some resources that may be of assistance to homeowners and landowners as they clean up after the storm and plan for what’s next in their woods and yards. Research […]

Continue Reading

New publication: Diseases of spruce trees in Minnesota

Announcement received today from Michelle Grabowski: Just wanted to let you know about a new tree resource. With the help of Cyndy Ash Kanner, and reviews from Joe O’Brien of the USDA Forest Service and Jim Walla of NDSU, we now have a new publication on diseases of spruce trees including photos, id info, biology and management. The spruce diagnostic […]

Continue Reading

Minnesota woodlands and climate change

Alternate formats: Narrated presentation: This content is available as a web-based seminar, or “webinar,” recorded on April 20, 2010. Click here to watch the recording now. After watching it, please fill out our quick evaluation form.  Learn more about other Minnesota Extension forestry webinars. Or view just the slides, no narration. PDF version of this page (717KB) Section 1:  How Minnesota’s […]

Continue Reading

Planting depth study

Effects of Various Planting Depths on Tree Health and Root Systems By Katie Frerker Study Background Since 1994, a number of different studies have been performed that looked at the correlation between depth of soil over roots and the health of trees and root systems. The results showed that soil depths of more than 1 inch over the first main […]

Continue Reading

Diseases and Insect Pests of Hardwoods (Broadleaf trees)

General Information: Disease Management Recommendations for Trees and Shrubs Specific Diseases/Insects: Anthracnose and Other Leaf Spot Diseases of Maples Anthracnose Diseases of Eastern Hardwoods (USFS) Anthracnose of Shade Trees Aphids on Deciduous Trees and Shrubs Aphids on Trees and Shrubs Apple Scab Armillaria Root Disease USFS Carpenter Ants-can affect any standing wood/lumber Damping-off of Seedlings Emerald Ash Borer Environmentally Conscious […]

Continue Reading

Seasonal Care for Trees and Shrubs in Northern U.S. Climates

Welcome to the world of tree care! In the left hand column of the image below, you will find links to the many maintenance duties you can do to help keep your landscape trees healthy and safe. The accompanying chart highlights the most favorable timing for the listed tree care activities. Below this chart you can find links to other complete chart versions that are larger and easier to read.

Continue Reading

Seasonal care for trees & shrubs: Safety

Inspect your landscape trees and shrubs often- especially after storms. After storms, hazard trees with loosely hanging branches or split trunks need to be removed as soon as possible to avoid any damage to buildings, people, and to other trees or shrubs.

At other times of the year keep a watchful eye for developing decay in trunks and roots, broken and hanging branches, dead branches or trees, an abnormally leaning tree, or anything that may indicate that a tree or part of it could fail and cause damage or injury.

Continue Reading

Seasonal care of trees & shrubs: Stem and branch protection

The stems of landscape trees and shrubs may need protection from animals or mechanical equipment, especially during the winter months. Animal damage (feeding or rubbing) can be avoided by placing wire mesh or hardware cloth at least 3” from the stem. Mechanical damage (e.g. lawn mower or weed whip abrasion) can be avoided when a mulch ring (see mulch) or a plastic guard is in place. The plastic guard should only encase the portion of the lower stem that is most likely to be damaged by lawn equipment. As the tree grows the plastic guard will need to be removed and replaced in order to prevent girdling or stem constriction.

Continue Reading