Geranium: Bacterial blight categories: Flowers Geranium Geranium Diseases Ornamentals last review date: 2026-05-14 09:15 Geranium stem rot Photo by: R.S. Byther Biology bacterial blight (leaf spot and stem rot) arises due to a bacterium that can survive in soil for more than 6 months. These bacteria cannot survive in soil after the plant decomposes. They are […]
Geranium: Botrytis leaf spot and blossom blight categories: Flowers Geranium Geranium Diseases Ornamentals last review date: 2026-05-14 09:34 Botrytis blight damage on geranium flower Photo by: R.S. Byther Biology Botrytis is a fungus which thrives under mild environmental conditions. Brown, water-soaked areas appear on leaves and petals. The spots soon dry out and become covered […]
Geranium: Oedema categories: Flowers Geranium Geranium Diseases Ornamentals last review date: 2026-05-14 09:53 Oedema symptoms on top and bottom of geranium leaf Photo by: R.S. Byther Biology Oedema is a physiological problem that occurs when the soil is warmer than the air, soil moisture is high, and relative humidity is also high. Lower transpiration rates […]
Geranium: Rust categories: Flowers Geranium Geranium Diseases Ornamentals last review date: 2026-05-15 05:57 Geranium rust: upper leaf surface and lower leaf surface Photo by: R.S. Byther Biology Rust is caused by a fungus that lives on plants and plant debris. This disease can spread by wind-blown spores or infected cuttings. Infections occur easily if leaves […]
Geranium: Tobacco budworm categories: Flowers Geranium Geranium Insects Ornamentals last review date: 2026-05-15 06:06 Tobacco budworm damage on geranium leaf Photo by: J. Berger, bugwood.org Biology Tobacco budworm larvae attack several ornamental flowers including petunia, rose, geranium, and nicotiana. They feed primarily on buds, petals, and developing seed pods, but will feed on shoot tips […]