A plant's genetic capacity to resist infection by Podosphaera xanthii or related fungi that cause powdery white growth on leaf surfaces, particularly problematic in humid, warm climates.
Marji's Magic from Huckleberry Hill Farms is specifically selected by Johnny Casali for its extreme PM resistance — he advises no preventative spraying at all. Lance is noted as susceptible to PM in Colombia's high-humidity environment, while BOP is described as resistant.
Discussed in: Ep 005