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Pupulin, M.* ; Wang, X.S.* ; Efendiyev, M.A. ; Giletti, T.* ; Eberl, H.J.*

A PDE-ODE coupled spatio-temporal mathematical model for fire blight during bloom.

J. Math. Biol. 91:67 (2025)

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Fire blight is a bacterial plant disease that affects apple and pear trees. We present a mathematical model for its spread in an orchard during bloom. This is a PDE-ODE coupled system, consisting of two semilinear PDEs for the pathogen, coupled to a system of three ODEs for the stationary hosts. Exploratory numerical simulations suggest the existence of travelling waves, which we subsequently prove, under some conditions on parameters, using the method of upper and lower bounds and Schauder's fixed point theorem. Our results are likely not optimal in the sense that our constraints on parameters, which can be interpreted biologically, are sufficient for the existence of travelling waves, but probably not necessary. Possible implications for fire blight biology and management are discussed.

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