It is mentioned here because stem cuttings are a very popular and easy way to propagate geraniums. Blackleg: Blackleg is a disease of young plants and cuttings that is pretty much unmistakable. The removal of infected leaves and an application of fungicide is the best means of treating a sick geranium afflicted with rust. Reddish brown pustules develop on the underside of leaves with yellow areas forming directly over the pustules on the leaf’s surface. Pelargonium Rust: Unlike leaf spots and blights, which may be hard to discern from one another, rust fungus is fairly easy to identify. Fungicides may be applied at the first sign of disease to help curtail its spread. Prune off and destroy infected plant parts and keep the soil surrounding the plant clear of any debris. Affected blossoms fall prematurely and leaves touched by the descending petals will develop leaf spots or lesions. Usually, one of the first parts of the plant to become infected is the blossom, which turns brown, initially with a water-soaked appearance, and may transition to being covered with a coating of gray fungus spores. Botrytis Blight: Botrytis blight, or gray mold, is one of those geranium diseases that seem to be prevalent when the weather conditions are cool and damp. Plants infected with bacterial blight should be discarded and good sanitation measures should be practiced, especially with gardening tools and potting benches – basically anything that may have come in contact with the diseased geranium. The bacterium spreads into the vascular system of the plant via the veins and petioles of the leaves causing them, and eventually the entire plant, to wilt culminating in stem rot and death. Yellow wedge-shaped areas (think Trivial Pursuit wedges) can also form with the wide part of the triangular wedge being along the leaf margin and the point of the wedge touching a leaf vein. It can be identified by its circular or irregular shaped water-soaked spots/lesions, which are tan or brown in color. ![]() Bacterial Blight: Bacterial blight presents itself in a few different ways. The most common course of treatment for geranium problems like this is an application of fungicide. ![]() Individual spots may be surrounded by a yellow halo. Upon examination of each individual spot, you will see the formation of concentric rings, which are reminiscent of the growth rings you see on the stump of a cut tree. Alternaria Leaf Spot: Alternaria leaf spot is marked by dark brown, water-soaked circular spots that are ¼ to ½ inch (6 mm.
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