Symptoms of powdery mildew on indoor plants
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There are several fungal species that cause powdery mildew of indoor plants, but the symptoms are the same.
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The most obvious symptom is the white powdery coating on the surfaces of infected leaves and stems.
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The initial areas of mildew may start out as small spots of powdery white growth before growing together to form a white coating over the entire surface.
Management strategies
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Individual infected leaves can be picked off and destroyed.
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Any method that will lower the humidity, or increase air circulation will help to lessen the chances of infection.
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Space plants so that air can circulate between them to help reduce moisture.
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Registered fungicides can be used, but in most home conditions, removal of infected plant parts and adjustment of environmental conditions to promote better air circulation should help.