![]() You must destroy infected plants and apply a fungicide to protect healthy tissue. Reddening of infected tissue may occur at the soil line and leaves readily detach from collapsing plants. Rhizoctonia crown rot causes plants to wilt, collapse, blacken, and die. Do not propagate infected plants and apply a fungicide to protect healthy tissue. Pythium root rot turns roots a dark brown color and plants become wilted and yellow. This can only be prevented by applying fungicide to healthy tissue. Powdery mildew is a white, mealy fungal growth on the leaves and flowers and it causes them to dry out and die. This can be prevented by not propagating infected plants and applying fungicides to healthy tissue. It spreads to the petioles and leaf blades and leaves remain firmly attached as the plant collapses. Phytophthora crown rot is dark and water-soaked in appearance. Water plants so that the leaves stay dry and no water splashes from plant to plant. ![]() These spots become dry and dull black as they grow larger and plant growth is stunted. Foliar nematodes appear as small, tan sunken areas on the lower surfaces of leaves. This can be prevented by spacing plants and providing proper ventilation, removing fading flowers and yellowing leaves, and applying fungicides to protect healthy tissue. Botrytis blight appears as small, water-soaked lesions on damages petioles and then they spread to leaf blades and infected flowers fade prematurely. This can be avoided by not taking infected cuttings, avoiding high temperature and humidity conditions, and keeping new plants separate from old plants. Infected petioles have a greasy appearance. Bacterial blight shows up as dark reddish brown to black rotting areas on the roots and crown. They include bacterial blight, botrytis blight, foliar nematode, phytophthora crown rot, powdery mildew, pythium root rot, rhizoctonia crown rot, and ring spot. There are many diseases that can affect African Violets.
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