Infected flowers fade prematurely. Botrytis cinerea Space plants and provide ventilation to avoid high humidity. Remove fading flowers and yellowing leaves. Apply chlorothalonil or iprodione to protect healthy tissue. Foliar Nematode Small tan, sunken areas form on leaf tips and margins.
Spots become dry and dull black.
Aphelenchoides ritzema-bosi Destroy infected plants. Water plants in a manner that keeps leaf surfaces dry and does not splash from plant to plant. Myrothecium Rot Petioles of lower leaves develop darkened spots. Spots enlarge down stems and stems are easily broken. Myrothecium roridum Plant in pasteurized media.