Master Gardener April 2005

Updated:

Thursday, April 28, 2005

Instructor:

Dr. Vera Krischik

    Quiz 4: 2005 Tree Insect Diagnosis
 
Quiz 4 Instructions
  From your readings on the websites below and other websites, please answer the following questions. Cut and paste or attach your answer into the email message and add "MG" and your name and quiz number to the top of the answer. Answers should be emailed to MGADVANCED@LISTS.UMN.EDU. All enclosures must be labeled "last name, quiz #.doc."
Quiz 4 Questions
  Tree Diagnosis
  1. If you see a large elm tree with yellowing and flagging leaves, describe the three diseases it may have. How would you diagnose what was affecting the tree? What information would permit you to make a decision on what disease the tree has? Explain how insects vector two of those diseases. Describe the insect's life cycle, how the disease is vectored, how the disease kills the host, and what management is available. If a tree were very valuable, what pesticides would you use to control DED and the beetles?

  2. If you see a large oak tree with yellowing and flagging leaves, describe the diseases it may have. Describe oak wilt, how it spreads, what insect vectors it, and what is the management. How would you diagnose what was affecting the tree? What information would permit you to make a decision on what disease the tree has? Explain how insects vector the disease. Describe the insect's life cycle, how the disease is vectored, how the disease kills the host, and what management is available. If a tree were very valuable, what pesticides would you use to control oak wilt? Would you manage twolined chestnut borer?
Quiz 4 Online Resources
 
  1. Tree Insect Diagnosis (CUES)

  2. How to Differentiate Dutch Elm Disease From Elm Phloem Necrosis (USDA Forest Service)

  3. How to Identify and Manage Dutch Elm Disease (USDA Forest Service)

  4. How to Identify, Prevent, and Control Oak Wilt (USDA Forest Service)

  5. Insect and Mite Control on Woody Ornamentals and Herbaceous Perennials (Ohioline Bulletin 504)

  6. Diseases of Deciduous Trees: Elm - Bacterial Wetwood (CUES)
     
  7. Tree Injections and Implants (Harrell: University of Nebraska)


Nitidulid Beetles


European Elm Bark Beetle


Twolined Chestnut Borer


  CUES URL: http//www.entomology.umn.edu/cues/MG05/2005_quiz-4.htm
Last Revised: April 28, 2005
2005 The University of Minnesota
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