Pest Management Fact Sheet #5062 Authors: Dr. Alicyn Smart and Abigayl Novak For information about UMaine Extension programs and resources, visit extension.umaine.edu. Find more of our publications and books at extension.umaine.edu/publications/. Abiotic Disorder: Deficiency of Calcium Introduction Blossom end rot is a physiological disorder relating to a calcium deficiency and is detrimental to both