e-Gro Alert report by Roberto Lopez:
Calcium deficiency causes upper leaf necrosis in oriental lilies
Upper leaf necrosis on oriental lilies is really common. The symptoms can appear as curled, distorted, water-soaked, or necrotic upper leaves that appear “burned”, resulting in reduced aesthetic appeal and shrink for the grower. Research by Yao-Chien Alex Chang and William B. Miller at Cornell University has clearly demonstrated that these symptoms are related to a calcium deficiency disorder and they have termed the disorder upper leaf necrosis (ULN).
Click here to read the entire e-Gro Alert report on calcium deficiencies in oriental lilies by Roberto Lopez (PDF)