WIKINDX Resources
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Boguena, T., Meyer, S. E., & Nelson, D. L. (2007). Low temperature during infection limits ustilago bullata (ustilaginaceae, ustilaginales) disease incidence on bromus tectorum (poaceae, cyperales). Biocontrol Science and Technology, 17(1), 33–52.
Added by: Eric Peterson 2007-10-23 17:41:08 Last edited by: Eric Peterson 2009-08-25 12:49:55
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Categories: General
Keywords: Bromus tectorum, cheatgrass, downy brome, head smut, infection window, Ustilago bullata, weed biocontrol
Creators: Boguena, Meyer, Nelson
Collection: Biocontrol Science and Technology
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Number of views: 153
Popularity index: 100%
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Abstract
Ustilago bullata is frequently encountered on the exotic winter annual grass Bromus tectorum in
western North America. To evaluate the biocontrol potential of this seedling-infecting pathogen,
we examined the effect of temperature on the infection process. Teliospore germination rate
increased linearly with temperature from 2.5 to 258C, with significant among-population
differences. It generally matched or exceeded host seed germination rate over the range
10258C, but lagged behind at lower temperatures. Inoculation trials demonstrated that the
pathogen can achieve high disease incidence when temperatures during infection range
20308C. Disease incidence was drastically reduced at 2.58C. Pathogen populations differed
in their ability to infect at different temperatures, but none could infect in the cold. This may
limit the use of this organism for biocontrol of B. tectorum to habitats with reliable autumn
seedling emergence, because cold temperatures are likely to limit infection of later-emerging
seedling cohorts.
Added by: Eric Peterson Last edited by: Eric Peterson
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