Cylindrocladium Plant Disease Facts Cooperative Extension - The Pennsylvania State University Cylindrocladium Gary W. Moorman Professor of Plant Pathology Fungi belonging to the genus Cylindrocladium attack over 100 woody ornamentals including azaleas, rhododendrons, camellias, junipers, white pine, and holly. Many foliage plants including asparagus ferns, palms, and spathiphyllum are susceptible as well. Depending on the host plant and species of Cylindrocladium involved, damping-off, wilt, root rot, stem canker, crown rot or leaf spot may occur. Azalea - Outer root tissues die and root vascular tissue is discolored.
Root rot results in wilting even in plants several years old.
Leaves turn brown and black and then fall. Cuttings may rot at base but roots develop above the rot. These plants often die after potting. Rhododendron - Stem and crown cankers form. Root and stem cankers develop.