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Short‐term variation in ascospore release by Phacidium infestans on the needles of Pinus sylvestris
Author(s) -
Kurkela T. T.
Publication year - 1995
Publication title -
european journal of forest pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.535
H-Index - 49
eISSN - 1439-0329
pISSN - 0300-1237
DOI - 10.1111/j.1439-0329.1995.tb01012.x
Subject(s) - spore , ascospore , relative humidity , scots pine , precipitation , horticulture , botany , humidity , environmental science , pinus <genus> , biology , atmospheric sciences , meteorology , geography , physics
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.