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Article
Variation in Rates of Spore Deposition of Fusarium circinatum, the Causal Agent of Pine Pitch Canker, Over a 12-Month-Period at Two Locations in Northern California
Phytopatholgy
  • M. Garbelotto, Department of Environmental Science, Policy, and Management, University of California, Berkeley
  • T. Smith, California Department of Forestry and Fire Protection, Davis
  • W. Schweigkofler, Department of Environmental Science, Policy, and Management, University of California, Berkeley
Document Type
Article
Publication Date
1-1-2008
Department
Natural Sciences and Mathematics
Abstract
Patterns of spore deposition by Fusarium circinatum, the causal agent of pine pitch canker (PPC) of Monterey pine (Pinus radiata) and other conifers, were studied between May 2003 and April 2004 at two sites in Northern California using a novel spore trapping method combined with a real-time polymerase chain reaction (PCR) approach. At each study site, two plots were sampled by placing spore traps at 100 m intervals along transects 600 m in length. The air was sampled continuously by exchanging the spore traps every 2 weeks. The spore deposition rate (DR), ranged from 0 to 1.3 × 105 spores m–2. Spores were detected throughout the year, with higher trapping frequencies (TF) during the rainy season (November to April), than during the dry season (May to October). The detection of spores on traps at distances larger than 200 m from any Monterey pine, suggests at least midrange aerial dispersal. Finally, different inoculum loads were associated with trees displaying different levels of disease symptoms, suggesting infectiousness of the pathogen varies as the disease progresses. This study represents one of the first documenting continuous inoculum pressure values over an entire year for a forest pathogen, and provides important epidemiological information that will be invaluable in the development of disease progression models.
Rights

Copyright © 2008 The American Phytopathological Society. All rights reserved.

Publisher Statement
Originally published as Garbelotto, M., Smith, T., & Schweigkofler, W. (2008). Variation in rates of spore deposition of Fusarium circinatum, the causal agent of pine pitch canker, over a 12-month-period at two locations in northern California.Phytopathology, 98(1), 137-143.
Citation Information
M. Garbelotto, T. Smith and W. Schweigkofler. "Variation in Rates of Spore Deposition of Fusarium circinatum, the Causal Agent of Pine Pitch Canker, Over a 12-Month-Period at Two Locations in Northern California" Phytopatholgy Vol. 98 Iss. 1 (2008) p. 137 - 143
Available at: http://works.bepress.com/wolfgang_schweigkofler/36/