Grower Information

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)

• Fungicide Resistance Background and Mechanisms of Resistance
• Annual FRAC Code List Updates
• FRAC Recommendations on Fungicide Mixtures for Delaying Resistance (pdf) (Updated in 2010)

University and Extension Resources

Disease Management and Spray Programs

• FRAME Factsheet – Vineyard Disease Management – A Checklist (pdf)
• FRAME Factsheet – Influence of Environmental Conditions on Grape Foliar and Fruit Disease and Their Management (pdf)
• 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 (pdf)

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

• UC IPM Grape Pest Management Guide

Southwest

• Texas A&M Annual Grape Pest Management Guide

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

• New York and Pennsylvania Pest Management Guidelines for Grapes

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

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