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goldenrod gall

A view of a goldenrod stem, looking up from the ground toward the sky. The stem has a large, round gall near the bottom of the picture. The gall is several times wider than the stem. Narrow green leaves extend out from the stem and the gall, and yellow flowers are blooming at the top of the stem.

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. Eurosta solidaginis, sometimes known as the goldenrod gall fly, causes spherical galls on goldenrod stems, such as the one shown here. (Photo by Leslie Mertz, Ph.D.)

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