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Transstadial transmission of Pythium in Bradysia impatiens and lack of adult vectoring capacity.

06:00 EDT 20th August 2010 | BioPortfolio

Summary of "Transstadial transmission of Pythium in Bradysia impatiens and lack of adult vectoring capacity."

Fungus gnats have been shown to transmit a variety of plant pathogenic fungi that produce aerial dispersal stages. However, few studies have examined potential interactions between fungus gnats and oomycetes, including Pythium spp. A series of laboratory experiments were conducted to determine if fungus gnat adults are vectors of several common greenhouse Pythium spp., including P. aphanidermatum, P. irregulare, and P. ultimum. An additional objective was to determine if P. aphanidermatum can be maintained transstadially in the gut of a fungus gnat larva through the pupal stadium to be transmitted by the subsequent adult. Adult fungus gnats did not pick up infectious Pythium propagules from diseased plants and transmit them to healthy plants in any experiment. Species-specific primers and a probe for real-time PCR were developed to detect the presence of P. aphanidermatum DNA in fungus gnat tissue samples. P. aphanidermatum DNA was detectable in the larval and pupal stages; however, none was detected in adult fungus gnats. These results are in agreement with previous studies that have suggested that adult fungus gnats are unlikely vectors of Pythium spp.

Affiliation

Cornell University, Entomology, Cornell University, Department of Entomology, Comstock Hall, Ithaca, New York, United States, 14853; sea35@cornell.edu.

Journal Details

This article was published in the following journal.

Name: Phytopathology
ISSN: 0031-949X
Pages:

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