Level and stability of pyrimorph resistance for the parental wild-type isolates and the resistant mutants of Phytophthora capsici.

aParent isolates were collected from the field locations. Mutants were obtained by mass selection on pyrimorph-amended medium.bEC50 = effective concentration for 50% inhibition of mycelial growth at the 1st transfer and the 10th transfer.cRF = resistance factor, a ratio of EC50 for a fungicide-resistant mutant relative to the EC50 for the parental isolate.dFSC = the ratio of RF values at the 1st and 10th transfers.