Disease Management
go.ncsu.edu/readext?524946
Multiple diseases of stevia have been identified in North Carolina. At this time, Septoria leaf spot is the most economically concerning disease. Septoria steviae is a foliar pathogen and under favorable environmental conditions entire stevia fields can become defoliated prior to harvest. Athelia rolfsii and Sclerotinia sclerotiourum are soilborne fungi endemic to many areas of NC. Disease incidence of these pathogens can vary greatly from farm to farm based on cropping history but is often patchy in distribution.
This publication discusses the symptoms and control of stem and root rot of stevia in North Carolina. 
Stem and Root Rot of Stevia Caused by A. rolfsii
This publication describes the symptoms and control of Sclerotinia sclerotiorum in the production of stevia. 
Sclerotinia Sclerotiorum Stem Rot on Stevia
This publication discusses the symptoms and management of septoria leaf spot in stevia production in North Carolina. 
Septoria Leaf Spot of Stevia