Abstract
The survival of spores of Septoria nodorum was found to be negatively correlated with ambient relative humidity. At relative humidities in excess of 80 % few spores were viable after 24 h at 20°C. Consequently, if spores do not encounter favourable conditions for germination and infection soon after dispersal they are unlikely, under field conditions, to contribute to disease development. Extracellular material from a spore suspension containing 5 × 10 5 spores per ml (cirrhus extract) reduced germination but had negligible effects on spore survival.
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