In the Experiment in Which Goldenrod Fields Were Either Sprayed

Short Answer

In the experiment in which goldenrod fields were either sprayed with insecticide or left as untreated controls, the treated goldenrod increased growth and shaded out all of the other species. The result was near monocultures of goldenrod in the treated fields compared to the control fields, where the density and height of goldenrod was reduced. What did researchers conclude from this result?