Abstract
All commercial mint (Mentha sp.) cultivars are susceptible to one or more races of rust (P. menthae). Mint strains resistant or immune to rust were identified from a 4 yr study of a diverse collection containing 703 accessions. Resistance or susceptibility of the host did not change during the study and mint strains identified as immune in 1976 remained so through 1979. Strains of M. arvensis, M. citrata, M. aquatica and M. rotundifolia had the highest degree of resistance and possess other characteristics important to a mint breeding program.

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