Refer to successive introductions of new genes for resistance followed by the subsequent increase in frequency of the corresponding virulence alleles in the population. After withdrawal of a now ineffective resistance gene, the frequency of corresponding virulence allele is expected to decrease.
Adapted from: Tronsmo, A.M., Collinge, D.B., Djurle, A., Munk, L., Yuen, J. and. Tronsmo, A. 2020 Plant pathology and plant diseases. CABI, Wallingford.
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