Knowledgebase
Rose fungicide #870221
Asked May 26, 2024, 11:15 PM EDT
Multnomah County Oregon
Expert Response
If it actually is botrytis, this diagnostic guide lists controls: https://pnwhandbooks.org/plantdisease/host-disease/rose-rosa-spp-hybrids-botrytis-bud-twig-blight
I suggest that you submit photos, visit an Extension office with photos and plant samples, or send plant materials to the OSU Plant Clinic: https://bpp.oregonstate.edu/how-submit-plant-materials
Good luck!