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goldenrod gall

Closeup of a goldenrod stem on which a gall has formed. The stem and gall are medium reddish-brown in color. The gall is about twice as thick as the stem extending below and above the gall. Above and below, narrow green leaves grow out from the stem. At the top of the picture, yellow goldenrod flowers can be seen, out of focus, in the foreground.

Evolutionary ecologist Glen Ray Hood, Ph.D., and his students at Wayne State University in Detroit are investigating which insect-induced plant galls are best able to accumulate contaminants. They are especially interested in galls on common plants, such as goldenrod. Gnorimoschema gallaesolidaginis, sometimes known as the goldenrod gall moth, causes elongate galls on goldenrod stems, such as the one shown here. (Photo by Leslie Mertz, Ph.D.)

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