There has been uncertainty in the potato industry regarding the significance of common scab infected seed in commericial seed lines, and their potential for transmitting the disease to new tubers. The project aimed to determine and clarify the relevance of seedborne infections and to evaluate methods for their control. Extensive studies were conducted to develop a safe and cost effective seed treatment methods that could be incorporated into current commercial operations for the control of infections. Field inspections were also conducted to improve understanding of the influence of field conditions on the disease.