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Related Experiment Video

Updated: May 16, 2025

Protocols for Robust Herbicide Resistance Testing in Different Weed Species

Protocols for Robust Herbicide Resistance Testing in Different Weed Species

Published on: July 2, 2015

Fungicide Selection, Disease Risk, and Grower Switching Behavior.

Jae Young Hwang¹, Sharmodeep Bhattacharyya², Shirshendu Chatterjee³

¹U.S. Department of Agriculture-Agricultural Research Service, Forage Seed and Cereal Research Unit, Corvallis, OR 97331, U.S.A.

|April 3, 2025

Summary

This summary is machine-generated.

Hop growers often switch from non-synthetic to synthetic fungicides based on disease incidence and application timing. Understanding these fungicide switching behaviors is key for effective disease management and reducing synthetic inputs.

Keywords:

epidemiology fungi hops

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Last Updated: May 16, 2025

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Published on: September 28, 2021

Area of Science:

Agricultural Science
Plant Pathology
Pest Management

Background:

Effective disease management in hop cultivation necessitates strategic decisions regarding pesticide application, including type, frequency, and timing.
Hop powdery mildew (Podosphaera macularis) poses a significant challenge, requiring growers to adapt their fungicide strategies.

Purpose of the Study:

To develop predictive models for estimating hop grower switching behavior between non-synthetic, synthetic, or mixed fungicide applications.
To identify key factors influencing growers' decisions to switch fungicide types for managing hop powdery mildew.

Main Methods:

Utilized binary and multinomial logistic regression models to analyze fungicide switching patterns.
Employed a random forest classification algorithm to determine the importance of various predictive variables.
Analyzed grower application data in relation to disease incidence and seasonal timing.

Main Results:

Growers predominantly used non-synthetic fungicides (61.5%), with significant switching to synthetic (21.5%) or mixed (17.0%) applications.
Switching likelihood was associated with the timing of the first non-synthetic application and increased with disease incidence.
Key predictors of switching behavior included time of year, grower effects, first application date, disease incidence, pruning, and cultivar susceptibility.

Conclusions:

Hop growers transition to more potent synthetic fungicides or mixtures during critical crop susceptibility periods and elevated disease pressure.
Reducing synthetic fungicide use is intrinsically linked to effective disease risk mitigation strategies.
Understanding grower decision-making processes is crucial for optimizing integrated pest management programs in hop production.