Geraniums become spindly because of a number of environmental problems. Orange dots on leaves Geraniums (Pelargonium hortorum) prefer moist soil, but can suffer from over-watering and wet conditions. 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. Geraniums are popular annual flowers. Figure 1. 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. 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 No flowers. Geraniums need to be fed. Many farmers may be wondering why some plants in their gardens may be having leaves appearing as though they have dark patches. Chlorosis of geranium (J.L. Herbaceous perennials particularly susceptible to Powdery mildewinclude Aster, Centaurea, Failure to pinch back long stems, excessive feeding and watering and overcrowding will also cause geraniums to look leggy and to fail to thrive. Many of 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. 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. Photo credit: SHS Griffin. Leaf Disease identification:. Photo - Robin Powell . 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. Over-watered geraniums will rot … Edema om Ivy Geranium. Forsberg) VIRUS DISEASES OF GERANIUM Several diseases of geran iums (Pelargonium species ) are caused by viruses. "It's … Greenhouse crops prone to infection include African violet, Begonia, Dahlia, gerbera daisy, Hydrangea, roses, Verbena, Kalanchoe, and poinsettia. 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. Insufficient light is a common cause. Damage to Geraniums From Over-Watering. Powdery mildews are one of the most common diseases of ornamental plants; many nursery,flower, and woody plants are susceptible. 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