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. Leaves fall even if only one or a very few spots form.
Twig dieback occurs if defoliation is severe.
Brown to black leaf spots have yellow halos. Spathiphyllum - Older foliage wilts and yellows. Roots die allowing the plant to be easily removed from the soil. Sunken black spots form at the base of petioles. Brown to black leaf spots have yellow halos.