· Rosecanker is the most common of the several kinds of fungi that can affect the canes of roses. When left unmanaged, they can eventually kill your rose plant. Read here to find symptoms and cures. · The grey mold fungus Botrytis cinerea attacks the blossoms of rose plants, especially hybrid tea roses. It cover petals with a brownish fuzz; it also affects the flower buds. View allJul 28, 2025 · Common canker is a fungal disease that infects plants through long stubs left by improper pruning or through other wound sites. Small yellow or reddish spots appear on canes and gradually enlarge. Later, the centers of the spots turn light brown and develop lengthwise slits in the bark. Coniothyrium wernsdorffiae causes brand canker, and Paraconiothyrium fuckelii (formerly Coniothyrium fuckelii) causes common canker. Both infect cane wounds caused by pruning, harvesting, insects, thorn scars, or scratches. There are no effective fungicides for most cankerfungi. Need more help? Symptoms Cankers can cause dead areas on the stem that can enlarge and eventually kill the stem or even the entire plant. However, depending on host and pathogen. · When your rose falls prey to a virus or fungus, you need to know what you’re dealing with to react appropriately. If foliage is deformed, discolored, or dropping, blooms are withered or failing to open, or canes are weak and spotted, your rose is likely struggling with disease. · Stem canker is one of the most common fungal diseases that can affect roses, and it can cause significant damage if not managed properly. If you notice dry, shriveled canes that spread quickly across your rose plant, it’s likely a sign of stem canker. · The grey mold fungus Botrytis cinerea attacks the blossoms of rose plants, especially hybrid tea roses. It cover petals with a brownish fuzz; it also affects the flower buds. · Common canker is a fungal disease that infects plants through long stubs left by improper pruning or through other wound sites. Small yellow or reddish spots appear on canes and gradually enlarge. Later, the centers of the spots turn light brown and develop lengthwise slits in the bark. Coniothyrium wernsdorffiae causes brand canker, and Paraconiothyrium fuckelii (formerly Coniothyrium fuckelii) causes common canker. Both infect cane wounds caused by pruning, harvesting, insects, thorn scars, or scratches. There are no effective fungicides for most cankerfungi. Need more help? Symptoms Cankers can cause dead areas on the stem that can enlarge and eventually kill the stem or even the entire plant. However, depending on host and pathogen. · When your rose falls prey to a virus or fungus, you need to know what you’re dealing with to react appropriately. If foliage is deformed, discolored, or dropping, blooms are withered or failing to open, or canes are weak and spotted, your rose is likely struggling with disease. · Stem canker is one of the most common fungal diseases that can affect roses, and it can cause significant damage if not managed properly. If you notice dry, shriveled canes that spread quickly across your rose plant, it’s likely a sign of stem canker.
