Question

Which mechanism of fungicide resistance development in plant pathogen populations occurs when repeated, exclusive use of a single-site-mode-of-action fungicide selectively favours the survival and reproduction of naturally occurring resistant mutant strains of the pathogen, eventually shifting the population to be dominated by resistant individuals?

A Fungicide resistance through directional selection
B Cross protection
C Systemic acquired resistance
D Hypersensitive response
E Antibiosis
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