BYGL Disease Digest May 1, 2008 POWDERY MILDEW ON ANNUALS
| POWDERY MILDEW ON ANNUALS |
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Dave Dyke reported that a greenhouse grower had reported a problem with a POWERY MILDEW infestation on some of his snapdragons during the cool, wet weather experienced recently in southeastern Ohio. This disease is quite common on snaps, but almost all landscapes have plants that become diseased with one of the powdery mildew fungi. Although the fungi that cause powdery mildew are usually different on different plants, all of the powdery mildew diseases are similar in appearance. Moderate temperatures (between 60 and 80F), high humidity and plant crowding are conditions conducive to the development of this disease. In most cases, prompt recognition and control actions can prevent severe damage to plants from powdery mildew diseases. To minimize the incidence of powdery mildew plant resistant cultivars if they are available. Avoid overhead irrigation and water early in the day to avoid prolonged periods of moisture on the leaves. Avoid planting susceptible plants in shady locations or in areas that lack good air circulation. Sanitation is a key to reducing the incidence of powdery mildew the next season. Remove plant debris under infected plants that contain inoculum that can over winter on dead leaves. For further information on this disease please refer to OSU FactSheet HYG-3047-96 below. For more information, see:
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| Last Updated ( Thursday, 01 May 2008 18:32 ) |
