Movement of plant pathogens in the crop canopy

Many spores released by plant pathogens are deposited within a few metres of their source. The distribution pattern within this zone influences the rate of spread of disease, and also controls the number of spores that leave the canopy and contribute to long-range dispersal. It would thus be valuabl...

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Bibliographic Details
Published in:	Philosophical transactions of the Royal Society of London. Series B, Biological sciences Vol. 302; no. 1111; pp. 559 - 574
Main Author:	Legg, B.J
Format:	Journal Article
Language:	English
Published:	London The Royal Society 24-08-1983
Subjects:	Barley Fungal spores Gusts Lagrangian function Leaves mathematics and statistics plant diseases and disorders plant health Plant spores Spore dispersal Spores Turbulence Vegetation canopies
Online Access:	Get full text
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Summary:	Many spores released by plant pathogens are deposited within a few metres of their source. The distribution pattern within this zone influences the rate of spread of disease, and also controls the number of spores that leave the canopy and contribute to long-range dispersal. It would thus be valuable to develop a theory to describe the movement of spores within crop canopies, and explain the effects of airflow, crop structure, and height and mode of spore release. Conventional diffusion theory gives serious errors when used within a crop, and a random-walk theory, in which individual particle trajectories are simulated, provides a promising alternative. The three components of velocity are generated as Markov sequences with mean statistics that relate to the Eulerian windfield, and with correct Lagrangian timescales. This theory can readily incorporate the release of spores in gusts, and some implications for spore distribution are explored.
ISSN:	0080-4622 2054-0280
DOI:	10.1098/rstb.1983.0075