DISEASES

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Fusarium Wilt (Fusarium oxysporum f.sp. cyclaminis) Most susceptible plants: cyclamen Infection can occur at the seedling stage, with symptoms becoming obvious in older plants following an environmental trigger such as hot greenhouse temperatures. Symptoms: Infection is usually characterized by chlorosis of the leaf tissue, collapse of the leaf petiole, plant wilt and plant death. Lower leaves usually wilt and yellow first, followed by the rest of the foliage. The corm usually remains firm. The most distinguishing diagnostic feature of infection is the obvious brown-black discoloration of the internal tissue of the corm that can be seen if an infected corm is split lengthwise. Control: This disease is best controlled by strict sanitation. Remove infected plants as soon as symptoms develop. Fungicides have not proven effective.