Responding to an Introduced Pathogen: Podosphaera macularis (Hop Powdery Mildew) in the Pacific Northwest | Zendy

Walter F. Mahaffee | Zendy; Carla S. Thomas | Zendy; William W. Turechek | Zendy; Cynthia M. Ocamb | Zendy; Mark Nelson | Zendy; A. D. Fox | Zendy; W. D. Gubler | Zendy

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Responding to an Introduced Pathogen: Podosphaera macularis (Hop Powdery Mildew) in the Pacific Northwest

Author(s) -

Walter F. Mahaffee,

Carla S. Thomas,

William W. Turechek,

Cynthia M. Ocamb,

Mark Nelson,

A. D. Fox,

W. D. Gubler

Publication year - 2003

Publication title -

plant health progress

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.565

H-Index - 9

ISSN - 1535-1025

DOI - 10.1094/php-2003-1113-07-rv

Subject(s) - powdery mildew , biology , mildew , sphaerotheca , hop (telecommunications) , fungicide , agronomy , horticulture , engineering , telecommunications

Powdery mildew of hop (Humulus lupus L.), which is caused by Podosphaera macularis (formerly Sphaerotheca macularis) was found in the Yakima Valley, WA in 1996 and subsequently spread to the growing regions in Oregon and northern and southern Idaho. To rapidly assist growers in reducing the cost associated with the preventive fungicide program, the Gubler/Thomas grape powdery mildew risk infection model was adapted for hops. In addition, field surveys were utilized to identify other management practices that impacted disease development. Weather networks were established and utilized to deliver daily regional maps indicating the risk index. These maps were posted to the web for daily access. Lessons learned from this experience will be useful in addressing future pathogen

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