Hawthorn, English (Crataegus monogyna)

Remarks Although PNW data are lacking, cut stem applications with glyphosate, triclopyr, or imazapyr will likely be effective.

Site of action (imazapyr) Group 2: acetolactate synthase (ALS) inhibitor; (glyphosate) Group 9: inhibits EPSP synthase; (triclopyr) Group 4: synthetic auxin

Chemical family (imazapyr) imidazolinone; (glyphosate) none generally accepted; (triclopyr) pyridine