Sarah J Pethybridge

Sarah J. Pethybridge is a Professor in the School of Integrative Plant Science, Plant Pathology and Plant-Microbe Biology section at Cornell University's College of Agriculture and Life Sciences. Her research program focuses on fungal diseases affecting specialty crops in New York state production systems, with particular expertise in table beet, onion, and watermelon pathosystems.

Dr. Pethybridge's research interests span multiple dimensions of plant pathology:

• Fungal disease epidemiology and management in specialty crops
• Development and implementation of disease forecasting systems
• Characterization of pathogen population genetics and fungicide resistance
• Integration of digital tools for disease assessment and management
• Exploration of plant-microbiome interactions for disease suppression

Her publication record demonstrates consistent contributions to applied plant pathology, with recent work emphasizing practical solutions for growers facing challenges with Cercospora leaf spot, Stemphylium leaf blight, and other economically important diseases. Dr. Pethybridge has successfully translated research into practical field applications through tools like the Leaf Doctor mobile application and evidence-based disease management recommendations.

Her scientific contributions include:

• Characterization of Cercospora beticola population dynamics in New York table beet fields
• Documentation of emerging Stemphylium leaf blight in New York onion production
• Development of action thresholds for Cercospora leaf spot management
• Identification of alternative hosts for key pathogens
• Integration of seed treatment strategies with foliar disease management

Dr. Pethybridge maintains active collaborations with extension educators, growers, and researchers across New York state and internationally, ensuring her research addresses current production challenges while advancing fundamental understanding of plant-pathogen interactions.