2009 Fungicide Resistance Management Guide (733k PDF)

FRAC Tables (PDF)

Understanding FRAC Codes for Fungicide Resistance Management
Andy Wyenandt, Ph.D., Specialist in Vegetable Pathology

FRAC, or the Fungicide Resistance Action Committee, was developed to help provide fungicide resistance management guidelines for ‘at or high risk’ fungicides which have a high probability for fungi to develop resistance to because of their mode-of-action (MOA). Fungicides with chemistries that have a specific target site of activity against fungal pathogens, unfortunately, have a high risk for losing efficacy. Even so, fungicides with similar chemistries and similar MOA’s may also allow fungi to develop cross-resistance, where a fungus that develops resistance to one fungicide in the FRAC group may also develop resistance to other fungicides in the group, even if, those other fungicides haven’t been used. [read more ]