Fig. 1.

Seasonal fluctuations in DNA quantities or ascospore counts obtained by sampling airborne propagules collected over two autumns (a, b; 2006 and c, d; 2008) periods on Melinex tapes of a Burkard 7-day volumetric air sampler located in Poznan, Poland. Quantitative PCR assays detected avirulence alleles AvrLm1 (a, c; black line), AvrLm6 (a, c; grey line) or with primers based on β-tubulin (b, d; black line) or erg11 (b, d; grey line) fragments in the propagules of Leptosphaeria maculans. Ascospore release patterns (b, d; dotted line) were determined by light microscopic counts of Leptosphaeria-like ascospores per m³ of air