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Most plant diseases are caused by fungi, bacteria, and viruses. Although the term disease is usually used only for the destruction of live plants, the action of dry rot and the rotting of harvested crops in storage or transport is similar to the rots of growing plants; both are caused by bacteria and fungi.
Gladiolus (Gladiolus) Plant Health Problems. Diseases caused by Fungi: Botrytis leaf, stem, and corm rot, Botrytis spp. Symptoms of this disease can appear on leaves, flowers, stems, and corms. Flowers turn a papery brown and become covered with gray, fuzzy masses. Senescing flowers are particularly susceptible. Tan to brown spots with a target-like appearance can also develop on the leaves.