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Article
Detection and quantification of airborne conidia of Fusarium circinatum, the causal agent of Pine Pitch Canker, from two California sites using a Real Time-PCR approach combined with a simple spore trapping method
Applied and Environmental Microbiology
  • Wolfgang Schweigkofler, Department of Environmental Science, Policy, and Management, University of California, Berkeley
  • Kerry O'Donnell, Microbial Genomics Research Unit, National Center for Agricultural Utilization Research, Peoria, Illinois
  • Matteo Garbelotto, Department of Environmental Science, Policy, and Management, University of California, Berkeley
Document Type
Article
Publication Date
6-1-2004
Disciplines
Department
Natural Sciences and Mathematics
Abstract

Pinus radiata (Monterey pine), a tree native to coastal California and Mexico, is widely planted worldwide for timber production. A major threat to Monterey pine plantations is the fungal disease pine pitch canker, caused by Fusarium circinatum (Hypocreales). We present a novel trapping approach using filter paper in combination with a rapid molecular method to detect the presence of inoculum in the air. The assay is also useful for diagnosing the presence of the pathogen on plants. The test is based on the F. circinatum specific primer pair CIRC1A-CIRC4A, which amplifies a 360-bp DNA fragment in the intergenic spacer region of the nuclear ribosomal operon. Real-time PCR was used to calculate the number of fungal spores present in each reaction mixture by comparing the threshold cycle (Ct) of unknown spore samples to the Ct values of standards with known amounts of F. circinatum spores. The filter paper method allows prolonged and more sensitive spore sampling in the field compared to traditional traps using petri dishes filled with selective medium. A field test at two sites in coastal California infested with pine pitch canker was carried out during the summer and fall of 2002. Spore counts were in the range of ca. 1x103 to ca. 7x105/m2, with the highest spore counts in the fall, suggesting a seasonal fluctuation.

Rights

Copyright © 2004 American Society for Microbiology. All rights reserved.

Publisher Statement
Originally published as Schweigkofler, W., O'Donnell, K., & Garbelotto, M. (2004). Detection and quantification of airborne conidia of Fusarium circinatum, the causal agent of pine pitch canker, from two California sites by using a real-time PCR approach combined with a simple spore trapping method. Applied and Environmental Microbiology, 70(6), 3512-3520.
Citation Information
Wolfgang Schweigkofler, Kerry O'Donnell and Matteo Garbelotto. "Detection and quantification of airborne conidia of Fusarium circinatum, the causal agent of Pine Pitch Canker, from two California sites using a Real Time-PCR approach combined with a simple spore trapping method" Applied and Environmental Microbiology Vol. 70 Iss. 6 (2004) p. 3512 - 3520 ISSN: 0099-2240
Available at: http://works.bepress.com/wolfgang_schweigkofler/28/