Progenies of ‘Golden Delicious’ apple ( Malus domestica Borkh.) crossed with 12 Malus species and hybrids were screened for resistance to powdery mildew incited by Podosphaera leucotricha (Ell. & Ev.) Salm. under greenhouse conditions. Noninfected seedlings were recovered from Morton Arboretum (M.A.) 8 (an unknown interspecific hybrid), M. zumi calocarpa Rend., M. sargenti Rehd. 843 × self, and M. baccata jackii Rehd. Evidence for a single heterozygous dominant gene conferring resistance in M.A.8 and M. sargenti was confirmed by field tests of resistant seedlings.
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Korban et al. (1983) studied this question.
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