Powdery Mildew and Fungicide Resistance Testing
Field Sampling Instructions
- FRAME Factsheet: Collecting Pathogen Samples for Fungicide Resistance Monitoring Fact Sheet (PDF)
- Video Tutorial: How to build a rotating arm Spore Trap for grapevine powdery mildew (YouTube video)
Understanding Test Results
- FRAME Factsheet: Interpreting FRAC 11 (QoI) Fungicide Test Results – Decision Tree for Disease Management (PDF)
- FRAME Article: Interpreting FRAC 3 (DMI) Fungicide Resistance Test Results (PDF)
- Fungicide Resistance Dashboard (Interactive website 2018-2022)
Understanding Fungicide Resistance
- FRAME Video – Fungicide Resistance – What is it and how does it occur? (YouTube Video)
- FRAME Video –FRAME – Resistencia a fungicidas – Qué es y cómo occure? (YouTube Video)
- FRAME Factsheet – Understanding Fungicide Resistance Management in Vineyards Fact Sheet (PDF)
- FRAC and CropLife – Fungicide Resistance Management (YouTube Video)
FRAME Trade Articles
(These, and other articles, are also available at our Publications page).
- A Framework to Manage Fungicide Resistance in Grape Powdery Mildew – Wine Business Monthly / Practical Vineyard and Winery
- Good to Know: Dialing in disease control. Best practices for fungicide stewardship. – Good Fruit Grower
- Early Season Scouting for Grape Powdery Mildew – Good Fruit Grower
- Managing Fungicide Resistance in the Vineyard – American Vineyard
- Good to Know: Why some seasons are worse for powdery mildew – Good Fruit Grower
Fungicide Resistance Action Committee (FRAC)
University and Extension Resources
Disease Management and Spray Programs
- FRAME Factsheet – Vineyard Disease Management – A Checklist
- FRAME Factsheet – Influence of Environmental Conditions on Grape Foliar and Fruit Disease and Their Management
- Pesticide Redistribution and Its Impact on Pesticide Efficacy – from PNW Extnesion Publications (#722) – Authors: Warneke, Pscheidt, and Nackle
- FRAME Factsheet – Dispersion: A Spore’s Journey in Vineyards
Fungicide Resistance Information
- Fungicide Resistance and Fungicide Groups – in the Pacific Northwest Pest Management Handbooks – Plant Disease – Author Dr. J.W. Pscheidt, Oregon State University
- Introduction to Pesticide Resistance – from Pesticide Environmental Stewardship – Author Dr. W. Buhler, North Carolina State University
Regional Pest Management Guides
Pacific Northwest
- WSU Annual Pest Management Guide for Grapes
- OSU Annual Pest Management Guide for Grapes
- PNW Plant Disease Management Handbook
- Field Guide for Integrated Pest Management in Pacific Northwest Vineyards
California and Mountain States
Southwest
Midwest
- 2023-2024 Midwest Fruit Pest Management Guide
- Kentucky Fruit IPM – Grapes
- Michigan State Integrated Pest Management – Grapes
- Developing an Effective Fungicide Spray Program for Grapes in Ohio (PDF)
Northeast
Southeast and Mid-Atlantic
- Georgia Pest Management Handbook
- Virginia Annual Pest Management Guide: Horticultural and Forest Crops
- Mid-Altantic Vineyards Grape IPM
- Southern Region Small Fruits Consortium IPM Production Guide
Other Peer-Reviewed Resources
- Mixtures as a Fungicide Resistance Management Tactic – in Phytopathology 2014 Issue 104. – Authors F. van den Bosh, N. Paveley, F. van den Berg, P. Hobbelen, and R. Oliver
Let's be Social!
LinkedInApp’s of Interest
- FRAC MOA – Search which active ingredients belong to which mode of action group
- PMApp – Test your ability to rate powdery mildew! By the University of Adelaide.
- Calibrate My Sprayer – A quick tool to help with field calibration of sprayers by Clemson University.
Resistance Testing
Check with your local plant disease diagnostic service to see if they offer FRAC 11 (G143A) fungicide resistance testing.
While several commercial diagnostic companies have offered testing in the past, we are currently only aware of one company publicly advertising FRAC 11 fungicide resistance testing for grape powdery mildew:
If you are a US-based company offering fungicide resistance testing for grape pathogens, please let us know and we can add you to the list!