Abstract: The deposition of fungal diaspores was invesltigated from samples collected mainly from airfields throughout Finland in the period from June 7, 1967 to May 29, 1968. The number of collonies which had grown from the diaspores after 10 days in the laboratory were counted from agar plates, but no attempt was made to identify the fungi. In 1968 samples were taken in three spruce (Picea abies (L.) Karst.) stands of South Finland throughout 24 hour periods at weekly or fortnightly intervals. The correlation of diaspore deposition with weather elements was statistically analysed.