![]() ![]() Sanitation is usually enough to manage these diseases on healthy established plants. The fungus usually occurs on plant debris or weak plant tissue, such as old flowers, leaves. It can infect some vegetables, soft fruits, flowers, trees, and shrubs, especially when conditions are cool and damp. Stem cankers, sunken discolored areas, can cause twisting and even death of the stem. Gray Mold (Botrytis Blight) Botrytis blight or gray mold is a widely distributed disease caused by the fungus Botrytis cinerea. Even the air caused by walking past or pruning your plant can spread botrytis spores. Botrytis Blight Botrytis is spread through the air as the fine spores are lifted from the soil and carried to your geranium. These spots can be round and circular or irregular in shape. One of the most common fungi that attack geranium plants is botrytis blight, which is caused by the fungus Botrytis cinerea. Ongoing sanitation, fall clean up and better weather is usually enough to keep this disease under control.Ī bit more information: Several other fungal diseases can cause spots on the leaves and stems of peonies. Other factors, such as potash deficiency and Botrytis blight, may cause angular, dead patches, in geranium leaves but the wilted condition is always associated with bacterial blight infections (Figure 2). Botrytis is spread through the air as the fine spores are lifted from the soil and carried to your geranium. These leaves soon wither and hang on the petiole or drop off. Only clean up during dry weather as moisture helps spread the blight. One of the most common fungi that attack geranium plants is botrytis blight, which is caused by the fungus Botrytis cinerea. Remove infected parts and place in a paper bag for disposal. The greenhouse environment provides ideal growing conditions for both plants and plant pathogens. Look for the fuzzy gray growth and small black specs on the dead tissue. Botrytis blight on geranium (A) and aerial stem blight and sporulation on vinca (B). The bud blast and flower blights we see here may also occur on mums, dahlias, dogwood, geraniums, hydrangea, marigolds, and sunflowers. The disease attacks a variety of ornamental and edible plants and often is specific to the plant part infected. This fungal disease is most common in cool rainy as well as humid weather. Managing Botrytis Blight in the Gardenīrown buds that fail to open on peonies and some roses, especially the white and pink flowered varieties are likely the result of Botrytis Blight also known as Gray Mold. One of the most common fungi that attack geranium plants is botrytis blight, which is caused by the fungus Botrytis cinerea. Your browser doesn't support the HTML5 video tag.
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