Quantification and analysis of transmission rates for soilborne epidemics

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

Research output: Contribution to journalArticle

  • 28 Citations

Abstract

The rates of transmission of infection from inoculum or infecteds to susceptible hosts are critical determinants of epidemics, yet no formal experimental methods have been described for their quantification and analysis in spatially explicit epidemics. Replicated microcosms of >400 radish seedlings and with tight control of environmental conditions were exposed to known amounts of inoculum of the fungal plant pathogen Rhizoctonia solani. Spatiotemporal maps of disease progress were used to distinguish between primary and secondary infections and to count changes with time in the number of infected plants and the number of contacts between susceptible and neighboring infected plants. Transmission rates were defined within a compartmental S–I (susceptible–infected) model for plant epidemics and estimated empirically using counts from spatial maps. The transmission rate for primary infection declined with time; the transmission rate for secondary infection rose initially and then declined. We discuss the mechanisms contributing to the changes in transmission rates with time and show that spatial mapping combined with an epidemiological analysis provides accurate empirical estimates of transmission rates.
Original languageEnglish
Pages (from-to)3232–3239
Number of pages8
JournalEcology
Volume84
Issue number12
DOIs
StatePublished - 2003

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infection
inoculum
disease transmission
Thanatephorus cucumeris
radishes
plant pathogens
Rosa
environmental factors
seedlings
methodology
microcosm
pathogen
environmental conditions
seedling

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Otten, W., Filipe, J. A. N., Bailey, D. J., & Gilligan, C. A. (2003). Quantification and analysis of transmission rates for soilborne epidemics. Ecology, 84(12), 3232–3239. DOI: 10.1890/02-0564

Otten, Wilfred; Filipe, J. A. N.; Bailey, Douglas J.; Gilligan, Christopher A. / Quantification and analysis of transmission rates for soilborne epidemics.

In: Ecology, Vol. 84, No. 12, 2003, p. 3232–3239.

Research output: Contribution to journalArticle

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Otten, W, Filipe, JAN, Bailey, DJ & Gilligan, CA 2003, 'Quantification and analysis of transmission rates for soilborne epidemics' Ecology, vol 84, no. 12, pp. 3232–3239. DOI: 10.1890/02-0564

Quantification and analysis of transmission rates for soilborne epidemics. / Otten, Wilfred; Filipe, J. A. N.; Bailey, Douglas J.; Gilligan, Christopher A.

In: Ecology, Vol. 84, No. 12, 2003, p. 3232–3239.

Research output: Contribution to journalArticle

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AB - The rates of transmission of infection from inoculum or infecteds to susceptible hosts are critical determinants of epidemics, yet no formal experimental methods have been described for their quantification and analysis in spatially explicit epidemics. Replicated microcosms of >400 radish seedlings and with tight control of environmental conditions were exposed to known amounts of inoculum of the fungal plant pathogen Rhizoctonia solani. Spatiotemporal maps of disease progress were used to distinguish between primary and secondary infections and to count changes with time in the number of infected plants and the number of contacts between susceptible and neighboring infected plants. Transmission rates were defined within a compartmental S–I (susceptible–infected) model for plant epidemics and estimated empirically using counts from spatial maps. The transmission rate for primary infection declined with time; the transmission rate for secondary infection rose initially and then declined. We discuss the mechanisms contributing to the changes in transmission rates with time and show that spatial mapping combined with an epidemiological analysis provides accurate empirical estimates of transmission rates.

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Otten W, Filipe JAN, Bailey DJ, Gilligan CA. Quantification and analysis of transmission rates for soilborne epidemics. Ecology. 2003;84(12):3232–3239. Available from, DOI: 10.1890/02-0564