Controlling Invasives with Insects!

Posted by & filed under Uncategorized.

Doug Landis

At our April meeting at Calvin College Ecosystem Preserve we learned about the latest research on insects and other biological agents controlling the spread of invasives. Dr. Doug Landis, Professor of Entomology at Michigan State University spoke about three dreaded invasive plants— purple loosestrife, spotted knapweed, and garlic mustard.

We learned:

  • All organisms have natural enemies that limit their abundance.
  • In their native region many plants are effectively controlled by natural enemies.
  • If biocontrol agents do not control the target weed both can remain abundant.
  • If not host specific, agents may attack non-targeted plants.

In the U.S. the process below is regulated by the USDA.

  1. Selecting appropriate target weeds
  2. Selecting natural enemies
  3. Host specificity testing
  4. Release and evaluation efficiency

 

Examples in Michigan:

Rob Rutledge, Sault College, Bugwood.org

 

Purple LoosestrifeGalerucella calmariensis, commonly known as the black-margined loosestrife beetle, is a species of leaf beetle that eats off the growing points. It is a very successful agent in 3–5 years. The number of native plants have increased where loosestrife is suppressed.

 

 

 

University of Idaho Archive, University of Idaho, Bugwood.org

Spotted Knapweed – Cyphocleonus achates is a weevil that attacks the plants roots. C. achates was released to the Hiawatha National Forest in Michigan’s Upper Peninsula in summer 2009.

 

 

 

 

 

Chris Evans, River to River CWMA, www.forestryimages.org

 

Garlic Mustard – A search for suitable biological control agents for Garlic Mustard was started in 1998. Weevils in the genus Ceutorhynchus (Coleoptera: Curculionidae) are under consideration. C. allianrae and C. robertii weaken the plant. C. scrobicollis invades the roots and is the most effective. The USDA has tagged a proposal to introduce a biological control of Garlic Mustard, so hopefully this highly invasive plant will meet its demise in the U.S. in the near future.

 

 

 

Helpful links:

The University of Rhode Island Biological Control http://web.uri.edu/biocontrol

Report invasives at Midwest Invasive Species Network www.misin.msu.edu

2 Responses to “Controlling Invasives with Insects!”

  1. BBQLuv

    I really liked this recent websitepost! I read your blog fairly often and you arre
    frequently sharing some positive stuff. I published this on our Facebook
    and my friends loved it! Keep uup the great blog.
    🙂

    Reply

Leave a Reply

  • (will not be published)

XHTML: You can use these tags: <a href="" title="" rel=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>