Gardenia

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Old 04-11-07, 08:37 AM
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Unhappy Gardenia

My gardenias' leaves are small and black, it looks to me as mildew. Any help please. TIA
 
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  #2  
Old 04-11-07, 08:56 AM
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Sounds like your gardenias have sooty mold. See http://www.uri.edu/ce/factsheets/sheets/gardenia.html for common fungus problems for gardenias.

Sooty mold coats gardenia leaves in summer. This is usually due to an infestation of whiteflies, which look like bits of cotton. Like aphids, which cling to undersides of leaves, they excrete honeydew on which the fungus feeds. Using horticultural oil spray as an insecticide is helpful, as oil gets rid of many of the insect pests and also softens the black fungus so it can be washed off easier by rain or other means. Spray in such a way that both the upper and undersides of leaves are treated.
 
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