Powdery Mildew and Fungicide Resistance Testing
Field Sampling Instructions
- Grape powdery mildew sampling instructions – Using the cotton swab or the glove method (PDF)
- Video Tutorial: How to use the Cotton Swab method (YouTube video)
- Video Tutorial: How to build a rotating arm Spore Trap for grapevine powdery mildew (YouTube video)
Understanding Test Results
- Fungicide Resistance Dashboard (Interactive website)
- Interpreting FRAC 11 (QoI) Fungicide Test Results – Decision Tree for Disease Management (PDF)
- Interpreting FRAC 3 (DMI) Fungicide Resistance Test Results (PDF)
Understanding Fungicide Resistance: Videos
- FRAME – Fungicide Resistance – What is it and how does it occur? (YouTube Video)
- FRAME – Resistencia a fungicidas – Qué es y cómo occure? (YouTube Video)
- FRAC and CropLife – Fungicide Resistance Management (YouTube Video)
University and Extension Resources
- 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
- Pesticide Redistribution and Its Impact on Pesticide Efficacy – from PNW Extnesion Publications (#722) – Authors: Warneke, Pscheidt, and Nackle7
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
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
Fungicide Resistance Action Committee (FRAC)
App’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
Interested in participating in grape powdery mildew resistance testing? Contact your regional representative below:
Pacific Northwest
Michelle Moyer or Walt Mahaffee
California
Northeast
Southeast
Midwest
Southwest
Are you a local Extension specialist interested in participating for your region? Contact Michelle Moyer.