Article

 

Development of Partial Ontogenic Resistance to Powdery Mildew in Hop Cones and Its Management Implications Public Deposited

Downloadable Content

Download PDF
https://ir.library.oregonstate.edu/concern/articles/gb19f751p

To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The article was published by the Public Library of Science and is in the public domain. The published article can be found at:  http://www.plosone.org/.

Descriptions

Attribute NameValues
Creator
Abstract
  • Knowledge of processes leading to crop damage is central to devising rational approaches to disease management. Multiple experiments established that infection of hop cones by Podosphaera macularis was most severe if inoculation occurred within 15 to 21 days after bloom. This period of infection was associated with the most pronounced reductions in alpha acids, cone color, and accelerated maturation of cones. Susceptibility of cones to powdery mildew decreased progressively after the transition from bloom to cone development, although complete immunity to the disease failed to develop. Maturation of cone tissues was associated with multiple significant affects on the pathogen manifested as reduced germination of conidia, diminished frequency of penetration of bracts, lengthening of the latent period, and decreased sporulation. Cones challenged with P. macularis in juvenile developmental stages also led to greater frequency of colonization by a complex of saprophytic, secondary fungi. Since no developmental stage of cones was immune to powdery mildew, the incidence of powdery mildew continued to increase over time and exceeded 86% by late summer. In field experiments with a moderately susceptible cultivar, the incidence of cones with powdery mildew was statistically similar when fungicide applications were made season-long or targeted only to the juvenile stages of cone development. These studies establish that partial ontogenic resistance develops in hop cones and may influence multiple phases of the infection process and pathogen reproduction. The results further reinforce the concept that the efficacy of a fungicide program may depend largely on timing of a small number of sprays during a relatively brief period of cone development. However in practice, targeting fungicide and other management tactics to periods of enhanced juvenile susceptibility may be complicated by a high degree of asynchrony in cone development and other factors that are situation-dependent.
Resource Type
DOI
Date Available
Date Issued
Citation
  • Twomey, M. C., Wolfenbarger, S. N., Woods, J. L., & Gent, D. H. (2015). Development of partial ontogenic resistance to powdery mildew in hop cones and its management implications. PLoS ONE, 10(3), UNSP e0120987. doi:10.1371/journal.pone.0120987
Journal Title
Journal Volume
  • 10
Journal Issue/Number
  • 3
Rights Statement
Funding Statement (additional comments about funding)
Publisher
Peer Reviewed
Language
Replaces
Additional Information
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2015-08-03T15:58:29Z (GMT) No. of bitstreams: 2 license_rdf: 1370 bytes, checksum: cd1af5ab51bcc7a5280cf305303530e9 (MD5) TwomeyMeganBotanyPlantPathDevelopmentPartialOntogenic.pdf: 10594024 bytes, checksum: 837fab6a34fff226f78ee78aef2d8f8e (MD5)
  • description.provenance : Made available in DSpace on 2015-08-03T15:58:29Z (GMT). No. of bitstreams: 2 license_rdf: 1370 bytes, checksum: cd1af5ab51bcc7a5280cf305303530e9 (MD5) TwomeyMeganBotanyPlantPathDevelopmentPartialOntogenic.pdf: 10594024 bytes, checksum: 837fab6a34fff226f78ee78aef2d8f8e (MD5) Previous issue date: 2015-03-26
  • description.provenance : Submitted by Patricia Black (patricia.black@oregonstate.edu) on 2015-08-03T15:58:08Z No. of bitstreams: 2 license_rdf: 1370 bytes, checksum: cd1af5ab51bcc7a5280cf305303530e9 (MD5) TwomeyMeganBotanyPlantPathDevelopmentPartialOntogenic.pdf: 10594024 bytes, checksum: 837fab6a34fff226f78ee78aef2d8f8e (MD5)

Relationships

Parents:

This work has no parents.

Items