![]() Around the edge, you’ll see a yellow halo forming.Īlternaria leaf spot only affects the foliage, not flowers. Unlike rust fungus, which has a single brown central spot, alternaria leaf spots have one light brown spot with several inner dark brown rings within the spot. On closer inspection, it can be multiple smaller spots grouped together forming a mass. Most spots will be smaller than one-third of an inch (roughly 0.85 cm), but these can come together, creating what looks like one bigger spot. These form in clusters, though, and the sizes will be sporadic. Spots on geranium leaves caused by the alternaria fungus can grow to a quarter to half-inch (0.5 cm to 1.25 cm) in size. High humidity is when rust fungus thrives. Left untreated, it will cause premature defoliation.Ī fungicide treatment may be needed if a lot of leaves are infected, but when it’s only mild, pruning geraniums will help increase air circulation, which reduces humidity levels. ![]() Heavily infected leaves can be pinched off geraniums. These need to be removed, and the plant should be isolated to prevent rust from spreading. “Pus-tules” get their name because inside the small pimples is pus. Pustules are like pimples appearing on the underside of leaves. If you see yellow spots on the top of a leaf, look underneath it to see if there are pustules forming. On the top side, the texture of the leaf will be rough, and it’ll have yellow spots. You’ll notice the brown centers on the underside of the leaf. In the later stages (when the spots turn brown) the fungus is easier identified by the brown dots in the center of the yellow spots. It’s difficult to identify this fungus, especially during its early stages. The fungus is called Puccinia pelargonii-zonalis, and it will spread. The spots start on the leaf’s underside.Īt first, they have a pale green color gradually, the geranium leaves are turning yellow, then they take a dark brown hue. Geranium rust is a common fungal infection that causes small spots on geranium leaves. ![]() Spots on geranium leaves can be indicative of edema, botrytis, geranium rust, alternaria leaf spot, or just be spots caused by the 4-lined plant bug feeding on your geranium leaves. Spots on Geranium leaves usually start yellow, then turn brown. Frequently Asked Questions Related to Spots on Geranium Leaves?.
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