European Journal of Forest Pathology (1995) 25, 274-281

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T.T. Kurkela (1995)
Short-term variation in ascospore release by Phacidium infestans on the needles of Pinus sylvestris
European Journal of Forest Pathology 25 (5), 274-281
Abstract: Ascospore release by Phacidium infestans was monitored with volumetric-recording spore traps in Finland. Detached branches of Scots pine infected naturally during the previous winter were used as a spore source. Spores were trapped during two autumns with simultaneous recording of weather factors. Free water from rain or thawing of rime or snow on the needles was required to initiate the spore release. After the onset of rain, the number of spores reached its maximum in 4-6 h, while heavy rain decreased the liberation of spores into the air. The number of spores had a higher correlation both with relative humidity and with precipitation delayed 3-7 h than with current precipitation. Temperature did not directly affect the ascospore release. Only a few spores were trapped at temperatures below 0°C. The effect of wind on the release of spores was mainly negative, and indirect through decreasing humidity. No diurnal periodicity was detected in the spore release.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
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Database assignments for author(s): Timo Kurkela

Research topic(s) for pests/diseases/weeds:
population dynamics/ epidemiology
transmission/dispersal of plant diseases


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Gremmenia infestans Pine (Pinus) Finland