Hi, I am constantly battling buckthorn on my Washington county property (Grant, MN). I noticed last weekend that almost all of it has a kind of orange growth/fungus on the leaves. I do not poison it (just persistently hack it back), and I do not use any chemicals on my rustic "lawn". My hope is that it is a permanently debilitating disease that kills just buckthorn and will eradicate all my buckthorn (and all my neighbors' buckthorn) with no further effort on my part. Of course, I know nothing, but a boy can dream ... I wonder if you all might comment? I've attached a couple pictures, and please feel free to contact me at 612.868.5807. Happy to send a specimen. With Gratitude, Fritz Bergmann
Washington County Minnesota
Thank you for contacting Extension.