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Why Do Hosta Leaves Turn Yellow?
Why Do Hosta Leaves Turn Yellow?. While hostas have lovely foliage and are generally resistant to pests, they are susceptible to fungal and bacterial infections. Several diseases may cause hosta leaves to turn yellow. Some of the diseases, if left untreated, can kill the plant.
While hostas have lovely foliage and are generally resistant to pests, they are susceptible to fungal and bacterial infections. Several diseases may cause hosta leaves to turn yellow. Some of the diseases, if left untreated, can kill the plant.
Petiole Rot
Petiole rot is a fungal disease that can kill your hostas if not treated. An early sign of petiole rot is the outer leaves turning yellow. The fungi become active during warm, rainy weather, depositing a white thread of oxalic acid and enzymes that destroy the petiole tissue.
Phytophthora
Phytophthora are microorganisms that live in the soil and container mixtures without soil. They cause foliage blight that is characterized by yellow water-soaked spots where the leaf blade attaches to the petiole. The spots will eventually turn brown.
Bacterial Soft Rot
Bacteria enter through damaged parts of the plant. Symptoms include yellow and wilted leaves, collapse of the plant at the petioles and an aroma similar to dead fish, according to the Iowa State University Extension.
Anthracnose
Anthracnose is the most common fungus that attacks hosta foliage. It causes irregular yellow spots with dark borders. Sometimes the yellow spots will fall off, leaving holes in the foliage.
