Shara Carolina Ortiz Carvajal, a Master's student, is researching the prevention of rapid leaf collapse in Chrysanthemum. Cut flower chrysanthemum leaves can become chlorotic and necrotic during the first week in the vase. The cause of this phenomenon is currently unknown.
They are evaluating pre-harvest and postharvest strategies to reduce the occurrence of symptoms. Green-flowering cultivars are the most susceptible, however many cultivars display symptoms. We have ruled out the possibility of bacteria as the cause, and they have also eliminated water relations as a causal factor.
Source: floriculturealliance.org