Abstract
SummarySpores of Pyrenopeziza brassicae, which are mostly dispersed by rain splash, were trapped 4 m above and 20 m downwind of an oil-seed rape crop. This suggests that not all trapped spores were transported in ballistic splash droplets (100–2000 μm); indeed some were airborne during periods of dry weather following closely after rain. Vertical and horizontal spore concentration gradients corresponded to the gradients expected for spores with fall speeds of between 2 and 5 cm/sec. Atmospheric dispersal calculations suggest that such spores have the potential for transport over considerable distances to other susceptible crops.
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