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Tree
Diagnostics &
Other Forestry Related Issues
Diseases
and Insects:
Oak
wilt and Dutch elm disease
are found in this area. If you suspect either of these diseases, please
contact the Natural Resources
Coordinator at (952) 953-2570. The following are brief summaries of
other problems found in our urban forests. For additional information
on these problems, please see the Links
section:
Anthracnose - A leaf tissue fungus that causes
irregular patches of wilt. (See examples below) It can affect Ash, Maple,
and Oaks. For more info >>>
Aphids - Small, soft bodied insects that attack perennials,
annuals, trees, and shrubs. They cause curled and distorted leaves that
may drop prematurely. For more
info >>>
Apple Scab - A leaf tissue fungus that affects apple
and crab apple trees. The leaves will normally have yellow and brownish
spots that fall of prematurely. For more info
>>>
Buckthorn
- Invasive shrub-like species that is threatening our native forests.
Birds love the fruit and rapidly spread the seeds. Buckthorn is an aggressive
colonizer and prevents sunlight from reaching the forest floor. This
prohibits our native wildflowers, shrubs, and trees from regenerating.
For more info >>>
Cytospora Canker - A disfiguring disease
of spruce and other conifers. It attacks trees normally under environmental
stress and causes needle loss. For more
info >>>
Fire Blight - Commonly attacks mountain
ash, hawthorn, crabapple, and other fruit bearing plants. Leaves, twigs,
and blossoms wilt and turn black, as if they have been scorched by fire.
For more info >>>
Galls - Unsightly growths caused by insects
and fungus. They may appear as small bumps or large complicated structures.
They affect a evergreens, trees, and shrubs. For more
info >>>
Iron Chlorosis - Primary characteristics
are yellowing leaves while the main veins remain green. This problem
is commonly found in oak, maple, and river birch. For
more info >>>
Rhizosphaera Needle Cast - Causes premature
needle drop, and normally affects the inner portions of the lowest branches
of spruce and other conifers. For more info >>>
Tent Caterpillar (Fall Web Worm) - This
insect affects a variety of trees and shrubs causing defoliation and
creating large silk tent like nests in the branches. For
more info >>>
Tree
Diagnostics Resources
The University of Minnesota has a self-guided
web site to help homeowners diagnose their own tree, shrub, vegetable,
and turf-related diseases.
U
of MN Extension Service Plant Disease Diagnostics >>>
U
of MN Extension Serivce Index of Trees & Shrubs Insects / Diseases
>>>
U of
MN Extension Service: Forest Resources Extension
If you think your tree is infected with
oak wilt or Dutch
elm disease, please contact the Natural
Resources Coordinator at (952) 953-2570.
Links
to Other Information Resources:
Protecting
Trees from Construction Damage
U
of M Extension Service: Protecting Trees from Construction Damage: A
Homeowner's Guide
Links
to U of M Extension Serivce and UND Extension Service for Dutch Elm
Disease and Management Resources
Dutch
Elm Disease
History
of Dutch Elm Disease in Minnesota
How
to Identify and Manage Dutch Elm Disease
Links
to U of M Extension Serivce and USDA for Oak Wilt and Management Resources
Oak
Wilt in Minnesota
USDA
Forest Service, St. Paul Field Office: Oak Wilt Home Page
Links
to the U of M Extension Service for Additional Information on Other
Diseases and Insects
Insecticide
Suggestions to Manage Landscape Tree and Shrub Insects
Anthracnose Ash
Anthracnose,
Maple
Anthracnose Oaks
Aphids
Apple
Scab
Cytospora
Canker
Fire
Blight
Galls
Iron
Chlorosis
Rhizosphaera
Needle Cast
Tent
Caterpillar
Links
to the UND Extension Service for Additional Information
Dutch
Elm Disease
Other
Links to State and Federal Sites for Additional Information
Asian
Longhorn Beetle (MN Dept of Ag)
Buckthorn
(MNDNR)
How
to & Miscellaneous Publications (USDA)
For more information on other forestry related issues,
please contact the Natural
Resources Coordinator at (952) 953-2570.
To request of list of tree contractors licensed to work in Apple Valley,
please call 952-953-2570.
Content updated on:
19-May-2006
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