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Chicago Urban Gardening

The day to day experiences of a University of Illinois Extension Urban Horticulture Educator in Chicago, Illinois

Periodical Cicadas in Northern Illinois in 2007

Posted by Ron Wolford -

Several people have asked if and where any broods of periodical cicadas will emerge in Illinois in 2006. The answer is no, not in 2006. However, 2007 will be the year for an emergence in northern Illinois, including the Chicago metropolitan area. Marlatt's Brood XIII, of the 17-year cicada, also known as the Northern Illinois Brood, will emerge in 2007. Expect emergence when soil temperatures just below the soil surface reach 64 degrees F--by mid May to early June of 2007. Cicadas damage trees and shrubs by using their saw-like ovipositor (egg-laying organ) to cut a slit in twigs or shoots, then they lay their eggs into the slit. Nymphs later hatch and drop to the ground, where they burrow down to roots and begin their 17 years of feeding and development below the soil surface.

Years of emergence for the other broods are as follows:

  • Lower Mississippi River Valley Brood (Marlatt's XXIII): 13-year cycle, last emerged in 2002; next emergence in 2015.
  • Iowan Brood (Marlatt's III): 17-year cycle, last emerged in 1997; next emergence in 2014.
  • Great Southern Brood (Marlatt's XIX): 13-year life cycle, last emerged in 1998; next emergence in 2011.
  • Great Eastern Brood (Marlatt's X): 17-year cycle, last emerged in 2004; next emergence in 2021.
  • Northern Illinois Brood (Marlatt's XIII): 17-year cycle, last emerged in 1990; next emergence in 2007.

For an interesting look at cicadas (and even recordings of the songs of different species), check out the University of Michigan's Periodical Cicada Page at: http://insects.ummz.lsa.umich.edu/fauna/michigan_cicadas/Periodical/Index.html

Rick Weinzierl, Entomology, University of Illinois



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