Dispersal of Rhynchosporium secalis conidia from infected barley leaves or straw by simulated rain

Fitt, Bruce D.L., McCartney, H.A., Creighton, N.F. and Walklate, M.E.L. (1988) Dispersal of Rhynchosporium secalis conidia from infected barley leaves or straw by simulated rain. Annals of Applied Biology, 112 (1). pp. 49-59. ISSN 1744-7348
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Simulated rain (mean drop diameter c. 1 or 3 mm) was allowed to fall for 10 – 15 min on to barley leaves or straw infected by Rhynchosporium secalis (leaf blotch). The leaves were supported on a mesh through which run-off water drained and the straw was supported on a rigid surface on which run-off water collected. The numbers of R. secalis conidia and spore-carrying splash droplets collected by horizontal samplers (microscope slides and pieces of photographic film) decreased rapidly with increasing distance from and increasing height above the sources, with half-distances of 2 – 10 cm. Less than 10% of the spores or droplets reached heights of more than 30 cm. Incident drops 3 mm in diameter produced more spore-carrying droplets and dispersed more conidia than did 1 mm drops. The size category of splash droplets with the greatest proportion of the spore-carrying droplets dispersed by 3 mm drops was 200 – 400 μm, whether the source was infected barley leaves or barley straw. For leaves or straw the greatest proportions of spores were carried in droplets > 1000 μm in diameter. The mean diameter of spore-carrying droplets (478 μm) dispersed from free-draining leaves was less than that of droplets from straw plus run-off water (563 μm). However, the leaf source had more spores cm-2 and the mean number of spores per droplet was greater (113 as opposed to 6·8) than for the straw source.

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