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Boneset and gall midges

Brian Allman and Morgan Grant
Ecology class, BIO 342, Biology Department, DePauw University
Fall semester 2010

Common boneset, Eupatorium perfoliatum, grows in moist woods, thickets, and swamps.  Previous research has shown that galls on common boneset are similar to galls on goldenrod plants.  The goal of our research was to assess the success of galls relative to placement of the galls on common boneset plants. 

We hypothesized that the location of galls on the plants would be correlated with the success of the gall. 

Success of the gall was measured as the number of fly larvae found in the gall.  We measured stem length, gall position, gall diameter, number of larvae in gall, and gall placement (main stem vs. side stem).  

We found a significant correlation between gall diameter and number of larvae in the gall.  Larger galls contained more larvae.  There was no correlation between the position of the gall within plants and success of the gall.