Abstract
A mathematical model of a multiline is used to illustrate the relationships between the composition of the host crop, the readiness of the plant breeder to change crop composition, the yield losses and the composition of the pathogen population. The model shows that an infrequently adjusted multiline is incapable of preventing one genotype from dominating the pathogen population. The relative merits of multiline and monoculture strategies of employing resistance genes depend on the circumstances. Important considerations are stabilizing selection and the readiness of the plant breeder to change crop composition. Practical aspects of multiline implementation are discussed.

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