Impatients necrotic spot, tobacco ring spot, broadbean wilt, cucumber mosaic, tobacco necrosis virus.

Mosaic, malformed leaves, pale yellow ring spots, severe chlorotic mottling of leaves or plant stunting may occur. Plants collapse and die.A fine webbing of fungal growth may be seen between the infected stems and nearby soil particles.' Shiny blackened areas develop on the stems and petioles of established on the stems and petioles of established plants at and just above the soil line as plants collapse and die. Maintain a fungicide program to protect plants. Tissue beneath the fungus may die.Įxamine plants carefully and frequently to detect the onset of disease. White, mealy fungal growth develops on leaves, flowers, and stems. Powdery mildew, caused by Golovinomyces cichoracearum or Podosphaera sp. Crop production is challenged by numerous diseases affecting petal quality and plant health. Fibrous rooted cultivars have small brown leaf spots.Some cultivars exhibit no symptoms despite heavy infection. Hooker, is a spectacular cut flower popular around the world for its bold colors. Bronzed or water-soaked areas develop on leaves of some cultivars. Excessive red pigment develops in infected leaves. Remove dead and dying flowers and leaves. Maintain low humidity by spacing plants and venting to improve air circulation. Infected tissue is covered with dusty gray fungal growth. Destroy crop debris.Ĭuttings rot at their base. Remove infected leaves from Rex and tuberous types because they are not systemically infected. Discard infected plants particularly Rieger-types which are systemically infected. Botrytis, also called grey mold, is a fungal disease, and gardeners can recognize it when they see these symptoms in plants: Spotting or discoloration on leaves. Do not take cuttings infected plants.Water-soaked areas surrounded by yellow halos develop on leaves. Potential disease problems include impatiens necrotic spot virus, fungal blights. Apply etridiazole + thiophanate methyl or triflumizole to protect plants. Botrytis blight, also know as gray mold, is a fungal disease caused by. Lower stems have sunken lesions when infected. Roots become dark brown and rot as microscopic spores form in the cells.

Apply mefenoxam or fosetyl-Al to protect healthy plants. Lower leaves wilt, leaves fall and the plant dies. If plants are not flowering, chlorothalonil can be applied. Sometimes, heavy gray growth develops.Īpply triflumizole to protect plants. White, mealy fungal growth develops on the top of leaves. Apply etridiazole + thiophanate methyl to protect plants. Stems at the soil line die and plants collapse. Propagate and plant in pasteurized potting media. Plants are stunted and have many short shoots at the crown.ĭiscard infected plants. Remove fading flowers and yellowing leaves. Reduce humidity and maintain good air circulation. See: Greenhouse Plants, Ornamental - Gray Mold Cause The fungus Botrytis cinerea, which colonizes dead, dying, and wounded plant parts. Apply iprodione, mancozeb, or triflumizole to protect plants. Botrytis cinerea: Reduce humidity and maintain good air circulation. Remove fading flowers and yellowing leaves. Botrytis Blight: Flowers are spotted and stems rot. This fungus primarily infects older tissue and generally is not a. The dusty gray spores of the fungus are easily seen and infected areas can rapidly enlarge and cause tissue collapse. Reduce humidity and maintain good air circulation. Gray mold or Botrytis blight often begins with relatively large grayish to tan areas on older leaves or spent flowers. Target-like spots, often with purple or dark- colored borders form on the leaves.

Botrytis blight of impatiens