The urban forest includes all of the natural resources in an urban area – plants, soil, water, animals – and is often referred to as the “green infrastructure” of a community. Any residential, commercial or institutional community that has public services – streets, curbs, utilities – is considered an urban area, in contrast to a rural area. Urban forestry is […]
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 […]
The truth about adding soil over the roots of existing landscape trees. By Rebecca Koetter and Gary R. Johnson No, the title “Will Fill Kill?” has nothing to do with people’s propensity to stuff their digestive systems during Thanksgiving! Instead, it directs attention to the three most common questions from homeowners about relandscaping and construction activities around their trees: What […]
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.
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.
Keep a watchful eye for problems that may be developing on the plants in your landscape. Timely prevention is always more effective and economical than reacting to problems once they have developed. Certain samples can be sent to your local Plant Disease Clinic (.pdf) for diagnosis.
Foliage diseases my cause conifer needles to turn yellow or brown or drop prematurely. Hardwood leaves may develop yellow, brown, or black spots. These diseases weaken trees by reducing the ability of leaves to produce plant food.
Forest health is affected by insect outbreaks, diseases, invasive species, regeneration, fire ecology, natural disturbance, and many other factors. Not all insects and diseases are bad. Native insects and diseases are a normal part of a healthy forest. An example is the periodic defoliation events from forest tent caterpillars (sometimes called armyworms). Minnesota forests evolved in the presence of these bugs, […]