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Updated: Jan 28, 2026
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An Easy and Flexible Inoculation Method for Accurately Assessing Powdery Mildew-Infection Phenotypes of Arabidopsis and Other Plants
Published on: March 9, 2021
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First Report of Hop Powdery Mildew in the Pacific Northwest
C M Ocamb1, R Klein2, J Barbour3
1Department of Botany and Plant Pathology, Oregon State University, Corvallis 97331.
Plant Disease
|March 8, 2019
Summary
Hop powdery mildew (HPM) significantly impacted hop production in Washington, Idaho, and Oregon starting in 1997. The disease, caused by Sphaerotheca macularis, led to unharvested acreage and widespread infection in susceptible cultivars.
Area of Science:
- Plant Pathology
- Mycology
- Agricultural Science
Background:
- Hop powdery mildew (HPM) emerged as a significant threat to hop (Humulus lupulus L.) production in the Pacific Northwest.
- The disease caused substantial economic losses in Washington State during its initial observed year, 1997.
Purpose of the Study:
- To document the initial observation and spread of hop powdery mildew in Washington, Idaho, and Oregon.
- To identify the causal agent of HPM and describe its characteristics.
Main Methods:
- Field observations and surveys were conducted in commercial hop fields across Washington, Idaho, and Oregon.
- Pathogen isolation and identification were performed using morphological characteristics of conidia.
- Inoculation experiments with detached leaf disks were conducted under controlled conditions.
Main Results:
- HPM was first detected in Washington in 1997, spreading rapidly and causing an estimated 2,000 acres to go unharvested.
- The disease was subsequently identified in Idaho and Oregon in 1998, affecting numerous commercial fields.
- The causal agent was identified as Sphaerotheca macularis, characterized by unicellular, barrel-shaped conidia measuring 30-36 × 15-18 μm.
Conclusions:
- Sphaerotheca macularis poses a significant threat to hop production in the Pacific Northwest.
- Effective disease management strategies are crucial to mitigate the economic impact of HPM on the hop industry.
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