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Host mixture efficacy in disease control: effects of lesion growth analyzed through computer‐simulated epidemics
Author(s) -
LANNOU C.,
VALLAVIEILLEPOPE C.,
GOYEAU H.
Publication year - 1994
Publication title -
plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.928
H-Index - 85
eISSN - 1365-3059
pISSN - 0032-0862
DOI - 10.1111/j.1365-3059.1994.tb01603.x
Subject(s) - lesion , biology , biological dispersal , spore , growth rate , multiplication (music) , parasite hosting , host (biology) , microbiology and biotechnology , pathology , ecology , geometry , mathematics , medicine , population , demography , combinatorics , world wide web , computer science , sociology
Lesion growth varies among foliar parasites and in order to study the effect of lesion growth on the efficacy of host mixtures to control epidemics, we altered the epidemic simulator Epimul by integrating a lesion growth function into the model. A theoretical study was performed by simulating epidemics caused by parasites with different lesion growth rates, spore dispersal gradients and multiplication rates. We found that increases in lesion growth rates resulted in large decreases in the effectiveness of mixtures for disease control and interacted strongly with parasite multiplication rate and spore dispersal gradient. The decline in mixture efficacy for epidemics with high lesion growth rates was reduced when parasite multiplication rate was higher and spore dispersal gradient steeper. Our results suggested that the lower number of infections on susceptible plants in the mixture as a result of inoculum loss on resistant hosts was partially compensated by lesion growth.