The compound's mechanism of action is to mimic the auxin growth hormone indoleacetic acid (IAA). When sprayed on plants it induces rapid, uncontrolled growth. As with 2,4,5-T, fenoprop is toxic to shrubs and trees.
Fenoprop functions by mimicking the plant hormone auxin, indoleacetic acid (IAA), causing swift, unchecked growth when applied to plants. Like 2,4,5-T, it is toxic to bushes and trees.