Ascospore production period of Phacidium infestans, a snow blight fungus on Pinus sylvestris
1996
Kurkela, T.T. (Finnish Forest Research Inst., Vanda (Finland). Dept. of Forest Ecology)
Ascospore production of Phacidium infestans was monitored during two autumns in 1971 and 1974. Monitoring was done using recording spore traps, with excised branches of Scots pine that had been naturally infected during the previous winter as the spore source. Spore production began in September and continued until the snow covered the spore source in November or spore production capacity was exhausted in December. The highest spore counts were obtained in October. Relative humidity, temperature and precipitation hours correlated positively, and direct solar radiation hours negatively, with the number of spores. In regression analysis, however, the daily average relative humidity was the only significant independent variable explaining the daily number of spores.
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