Posts tagged ‘disease’

Minnesota forest insect & disease updates

Just a quick post in case you missed it: The Minnesota DNR, Division of Forestry has published the June 2009 Forest Insect & Disease Newsletter (PDF).  This is by far the best source of timely, quality information on insect and disease issues in the Minnesota woods. This summer’s issue includes a play-by-play of the discovery of emerald ash borer in the Twin Cities this spring.

The list of articles from the June 2009 issue is below.

  • Emerald ash borer found in Minnesota
    • Play-by-play
    • Updated firewood restrictions in on state land
  • Another cool and protracted spring
    • Winter injury of Colorado blue spruce
    • Two-lined chestnut borers
    • Forest tent caterpillars are at it again
    • Oak anthracnose
    • Ash plant bug and ash anthracnose
    • Bumper crop of seeds
    • Summer shorts
  • Heads-up
    • Approved firewood vendor applications now
      need to be renewed
    • Tick-borne diseases
  • Publications
    • Trees and Shrubs of Minnesota
    • IPM for Home Apple Growers
  • Feature Article
    • Wolves in sheep’s clothing: Outbreaks of
      previously obscure native forest
      insects
  • Handy and helpful websites for Forest Health

Read it now: June 2009 Forest Insect & Disease Newsletter (PDF)

July 23, 2009 at 8:41 am 2 comments

New publication: Diseases of spruce trees in Minnesota

Announcement received today from Michelle Grabowski:

Lirula needle blight. Photo by P. Hennon, http://bugwood.org

Lirula needle blight. Photo by P. Hennon, http://bugwood.org

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 tool will be coming soon and will link directly to this pub for management info.

Click here to read Diseases of Spruce Trees in Minnesota.

June 17, 2009 at 10:45 am Leave a comment

MDNR’s March 2009 Forest Insect & Disease Newsletter

Passing along an announcement from the Minnesota DNR, Division of Forestry:

Greetings from MN DNR Forest Health! The March 2009 issue of the Forest Insect & Disease Newsletter, focusing on invasive species, is now available at http://files.dnr.state.mn.us/publications/fid/fid_march09.pdf

Highlights include:
Firewood Restriction Law
Emerald ash borer: FAQ
Emerald Ash Borer Preparedness Plan
in development
Gypsy moth treatments planned
Sirex woodwasp update
Annosus root disease
Oak wilt: Suppression Program
Diplodia levels in nursery stock continues to decrease
Feature article: Invasive species management on DNR-administered lands

If you requested a paper copy, watch for it in the mail soon.

We hope you enjoy this issue of the Forest Insect & Disease newsletter.

March 17, 2009 at 9:10 am Leave a comment

Forest health: Foliage, stem, and branch diseases

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.

Continue Reading April 29, 2007 at 7:28 pm Leave a comment

Forest health: Insects

A review of categories of insects affecting tree and forest health: Defoliators, borers, sap-sucking insects, root-feeding insects, cone- and seed-destroying insects, and non-native invaders.

Continue Reading April 29, 2007 at 7:27 pm Leave a comment

Forest Health: Overview

Forest health is affected by insect outbreaks, diseases, invasive species, regeneration, fire ecology, natural disturbance, and many other factors.

Fungal growth on birch: Jim Frazier photo

Fungal growth on birch: Jim Frazier photo

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 (armyworms). Minnesota forests evolved in the presence of these bugs, and they recover quickly from outbreaks.

On the other hand, non-native, introduced insects, diseases, and plant species pose a serious threat. Invasives must be addressed quickly. Diseases like Dutch elm disease, shrub species like buckthorn, and new invasive insects like Gypsy moth and emerald ash borer can cause serious forest health problems. It’s critical that landowners learn to identify these species quickly and keep their woodlands healthy and free from invaders to the greatest degree possible.

The pages in this section are designed to provide basic information about forest health issues in Minnesota. Probably the best source of forest health information in Minnesota is the Forest Insect & Disease Newsletter, published by the MN DNR Division of Forestry.

As more and more invasives enter our woods, forest health can seem daunting at times. But it’s important that we all maintain vigorous, healthy native woodlands to the greatest degree we can. Most forest health threats are far easier to prevent than to eradicate once they’re established. Good luck! Your neighbors, as well as future generations, will thank you for it.


April 29, 2007 at 7:26 pm Leave a comment

Woodland invasive species in Minnesota

Some of the most common invasive species in Minnesota’s woods include buckthorn, garlic mustard, Dutch elm disease and the emerald ash borer. Others that might not come to mind could be earthworms or Gypsy moths. All of these species are non-native and are causing significant damage in Minnesota’s forests. You can find identification guides to common invasive species at the DNR invasive species index.

Continue Reading April 29, 2007 at 2:29 pm Leave a comment


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News and information of interest to Minnesota woodland owners. Sister site to MyMinnesotaWoods.org.

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