Empirical evidence of spatial thresholds to control invasion of fungal parasites and saprotrophs

Wilfred Otten, Douglas J. Bailey, Christopher A. Gilligan

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57 Citations (Scopus)


The ability to forecast invasion of harmful and beneficial organisms is becoming increasingly important in agricultural and horticultural production systems as well as in natural plant communities. • In this paper we examine the spread of a fungus through a population of discrete sites on a lattice, using replicable, yet stochastically variable experimental microcosms. • We combine epidemiological concepts to summarise fungal growth dynamics with percolation theory to derive and test the following hypotheses: first fungal invasion into a population of susceptible sites on a lattice can be stopped by a threshold proportion of randomly removed sites; second random removal of susceptible sites from a population introduces a shield which can prevent invasion of unprotected sites; and third the rate at which a susceptible population is invaded reduces with increasing number of randomly protected sites. • The broader consequences of thresholds for fungal invasion in natural and agricultural systems are discussed briefly.
Original languageEnglish
Pages (from-to)125-132
Number of pages8
JournalNew Phytologist
Issue number1
Publication statusPublished - 2004
Externally publishedYes


  • Rhizoctonia solani
  • Invasion thresholds
  • Biological control
  • Percolation
  • Epidemiology


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