Rose: Thrips categories: Flowers Ornamentals Rose Insects revision date: 2023-02-07 12:00 Thrips damage on basilPhoto by: A.L. Antonelli Biology Thrips are tiny yellowish to dark insects that feed in flower and leaf buds. Damaged leaves may be distorted, while infested flower buds may be distorted if they open. Heavily infested flower buds may fail to […]
Rose: Tobacco budworm categories: Flowers Ornamentals Rose Rose Insects revision date: 2023-12-02 09:17 Tobacco budworm damage to rose budPhoto by: W. Upham, Kansas State Univ, 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 […]
Rose: Viruses categories: Flowers Ornamentals Rose Rose Diseases revision date: 2023-02-07 12:00 Rose mosaic virus symptomsPhoto by: R.S. Byther Biology The most common virus disease of roses is rose mosaic, which may cause leaves to show yellow lines, rings, mottles, or netted patterns. These symptoms usually are seen in the spring on part or all […]
Rose: Western spotted cucumber beetle categories: Flowers Ornamentals Rose Rose Insects revision date: 2023-02-08 12:00 Western spotted cucumber beetlePhoto by: K. Grey Biology The western spotted cucumber beetle is a pest of many ornamentals and vegetables. About 1/4″ long, the adult beetles have yellow wing covers with black spots. The rest of the body is […]
Snapdragon: Downy mildew categories: Flowers Ornamentals Snapdragon Snapdragon Diseases revision date: 2023-02-07 12:00 Downy mildew on snapdragonPhoto by: R.S. Byther Biology Affected plants show stunting and pale yellowish green foliage. Leaves curl in and droop. Leaf undersides may develop a white to purplish fungal growth. The growing point usually dies, and the plant may break […]
Snapdragon: Rust categories: Flowers Ornamentals Snapdragon Snapdragon Diseases revision date: 2023-02-07 12:00 Severe snapdragon rustPhoto by: R.S. Byther Biology Rust is caused by a fungus that is spread by water or on clothes and in diseased cuttings. It is not carried in seed but seeds can be contaminated by the fungus on the outside. Upper […]
Petunia: Tobacco budworm categories: Flowers Ornamentals Petunia Petunia Insects revision date: 2023-12-02 09:17 Tobacco budworm (red form) feeding on petuniaPhoto by: S.D. Spain 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 […]
Impatiens: Downy mildew categories: Flowers Impatiens Impatiens Diseases Ornamentals revision date: 2023-02-20 12:00 Downy mildew on impatiensPhoto by: D. Ferrin, LSU Ag Center, bugwood.org Biology Downy mildew of impatiens is a disease affecting the standard garden impatiens, Impatiens walleriana, and its cultivars and hybrids. The disease is caused by a fungus-like organism which survives in […]
Hollyhock: Rust categories: Flowers Hollyhock Hollyhock Diseases Ornamentals revision date: 2023-02-09 12:00 Hollyhock rust symptoms and sporulationPhoto by: R.S. Byther Biology Hollyhock rust is caused by a fungus that overwinters in basal leaves which may live through the winter, or on plant debris. Spores remain viable for at least four months in the soil. Reddish, […]
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 […]