Over-watered geraniums will rot … There is an easy way of identifying this kind of common plant disease by looking for small and dark spots that are raised occurring on leaves of plants. Diseases of geranium (with photo) The root system of geranium, when water is stagnant in the soil, can be affected by rot, which causes yellowing and drooping of the aerial parts of the plant. Photo credit: SHS Griffin. Orange dots on leaves Herbaceous perennials particularly susceptible to Powdery mildewinclude Aster, Centaurea, Rust begins with yellow spots on the underside of the leaves and can rapidly progress with brown fungal spores called pustules in the center of each spot. Chlorosis of geranium (J.L. Edema om Ivy Geranium. The economic losses caused by these dis eases a re diffi cult to ass ess since infected plants are often symptomless and because both the cultivar and the environment in which the plants are Forsberg) VIRUS DISEASES OF GERANIUM Several diseases of geran iums (Pelargonium species ) are caused by viruses. Innis estimated about 25% of Van Atta's customers picking out seasonal blooms end up with at least one geranium plant. DISEASES OF SEEDLING GERANIUMS: The primary diseases encountered on seedling geraniums are Damping-Off, Pythium Root Rot, Rhizoctonia Root and Crown Rot, and Botrytis Leaf Blight, Crown Rot, and Flower Blight. Bacterial blight and Southern bacterial wilt are two common bacterial wilt diseases that cause similar symptoms in geranium and may result in significant losses. Bacterial blight, caused by the bacterium Xanthomonas campestris pv. Powdery mildews are one of the most common diseases of ornamental plants; many nursery,flower, and woody plants are susceptible. Insufficient light is a common cause. Geranium Rust: Learn to Recognize and Manage this Noxious Disease StevenN.Jeffers, DepartmentofPlantPathology &Physiology, ClemsonUniversity An epidemicofGeraniumRustin SouthCarolina'sLow Country Rust diseases, which are caused by a specific groupofbasidiomycetefungi, attacka numberof ornamentalandagronomiccrops annually. Failure to pinch back long stems, excessive feeding and watering and overcrowding will also cause geraniums to look leggy and to fail to thrive. Geraniums are popular annual flowers. Photo - Robin Powell . "It's … Bacterial blight is the more common of the two diseases. Leaf Disease identification:. Geraniums (Pelargonium hortorum) prefer moist soil, but can suffer from over-watering and wet conditions. Damage to Geraniums From Over-Watering. Many farmers may be wondering why some plants in their gardens may be having leaves appearing as though they have dark patches. Figure 1. Greenhouse crops prone to infection include African violet, Begonia, Dahlia, gerbera daisy, Hydrangea, roses, Verbena, Kalanchoe, and poinsettia. No flowers. Geraniums become spindly because of a number of environmental problems. LANSING, Mich. (AP) — Dozens of Michigan greenhouses destroyed a popular geranium after cuttings were found to be infected with rare bacteria that could threaten U.S. food crops if spread. Geraniums need to be fed. Diagnosing rust on geraniums can be a challenge for growers. Use either a controlled-release granular fertiliser such as Acticote for Roses or Osmocote for Flowering Plants every spring; or give a fortnightly application of liquid fertiliser such as Thrive, Powerfeed or Harvest, diluted following the instructions on the pack. Many of Challenge for growers symptoms in geranium and may result in significant losses over-watering and wet.... 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