Valencia orange trees starving for water, or receiving too much water, will display wilted leaves. Cut back watering to once every week or increase the amount of water if needed. Sooty canker is a fungus entering the tree through a wound, eventually spreading through the tree, which can cause foliage to wilt and kill it. Prune away infected sections and spray the tree with copper.
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Joyce Starr is a freelance writer from Florida and owns a landscaping company and garden center. She has published articles about camping in Florida, lawncare, gardening and writes for a local gardening newsletter. She shares her love and knowledge of the outdoors and nature through her writing.