Table of apple cultivar susceptibility to the powdery mildew fungus, Podosphaera leucotricha

^zR = resistant. Control only needed under high disease pressure.
S = susceptible. Control usually needed where disease is prevalent.
HS = highly susceptible. Control always needed where disease is prevalent. These cultivars should receive first priority when control is called for.

Data compiled by K. S. Yoder and A. R. Biggs from personal observations and the following sources:

Management Guide for Low-Input Sustainable Apple Production, A publication of the USDA Northeast LISA Apple Production Project and Cornell University, Rodale Research Center, Rutgers University, University of Massachusetts, and University of Vermont. 1990. (Apple disease managment section by D. A. Rosenberger, Cornell University).

A Grower's Guide to Apple Insects and Diseases in the Southeast. 1993. Alabama Cooperative Extension Service, Auburn University, Circular ANR-838. Ed. J. R. McVay, J. F. Walgenbach, E. J. Sikora, and T. B. Sutton.

Aldwinckle, H. S. 1974. Field susceptibility of 51 apple cultivars to apple scab and apple powdery mildew. Plant Disease Reporter 58:625-629.

Yoder, K. S., R. E. Byers, A. E. Cochran II, W. S. Royston, M. A. Stambaugh, and S. W. Kilmer. 1994. Evaluation of scab-resistant apple cultivars for cedar-apple rust and mildew susceptibility. 1992-93. Biological and Cultural Tests for Control of Plant Diseases 9:11.

Biggs, A. R., Yoder, K. S., and Rosenberger, D. A. 2009. Relative susceptibility of selected apple cultivars to apple powdery mildew. Plant Health Progress doi:xx.xxxx/PHP-2009-xxxx-xx-RS (submitted for publication).