How can crop rotation starve out pathogens with a limited host range?

Crop rotation functions as an effective eradication measure by introducing nonsusceptible crops into a field, which effectively starves out pathogens—such as specific bacteria, fungi, and nematodes—that possess a restricted host range.1

Because these pathogens rely on specific host plants to survive and reproduce, they are unable to thrive when their required host is absent. Many such organisms can only persist as long as the host residue remains in the soil, typically for a period of no more than a year or two. By rotating to a different, non-host crop, the pathogen's food source is removed, causing its population to decline significantly over time.1

It is important to note, however, that this method is not universally effective. Many pathogens are unaffected by rotation because they can survive as saprotrophs in the soil or maintain dormant, viable structures for many years, allowing them to wait until a susceptible host is planted again.1