How was the invasive plant the Klamath weed (Hypericum perforatum) controlled in California?

Question

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The Klamath weed was controlled in California by introducing a leaf-feeding beetle into the habitat. This beetle was imported from Australia in the 20th century and was shown to be an effective natural predator of the invasive weed. The beetle consumes parts of the weed and weakens it or kills it off, reducing its spread and impact on the ecosystem. Herbicides and plant pathogens were not used to control the Klamath weed in California, and releasing more cows to eat the weed would not be a reliable or sustainable solution.

How Was the Invasive Plant the Klamath Weed (Hypericum Perforatum)