Geranium: Bacterial blight categories: Flowers Geranium Geranium Diseases Ornamentals revision date: 2023-02-07 12:00 Geranium stem rotPhoto 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 readily spread […]
Geranium: Botrytis leaf spot and blossom blight categories: Flowers Geranium Geranium Diseases Ornamentals revision date: 2023-02-07 12:00 Botrytis blight damage on geranium flowerPhoto 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 with gray-brown […]
Geranium: Oedema categories: Flowers Geranium Geranium Diseases Ornamentals revision date: 2023-02-07 12:00 Oedema symptoms on top and bottom of geranium leafPhoto 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 coupled with […]
Geranium: Rust categories: Flowers Geranium Geranium Diseases Ornamentals revision date: 2023-02-09 12:00 Geranium rust: upper leaf surface and lower leaf surfacePhoto 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 are wet […]
Geranium: Tobacco budworm categories: Flowers Geranium Geranium Insects Ornamentals revision date: 2023-12-02 09:17 Tobacco budworm damage on geranium leafPhoto 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 and foliage […]