Table of apple cultivar susceptibility to the quince rust fungus, Gymnosporangium clavipes.
(Source of information and credits provided at the bottom of the page.)
Caution: There may be cultivar variability in susceptibility to quince rust due to geographic location.

^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 41 cultivars to cedar apple rust and quince rust. Plant Disease Reporter 58:696-699.

Biggs, A. R., Rosenberger, D. A., Yoder, K. S., Kiyomoto, R. K., Cooley, D. R., and Sutton, T. B. 2009. Relative susceptibility of selected apple cultivars cedar apple rust and quince rust. Plant Health Progress doi:xx.xxxx/PHP-2009-xxxx-xx-RS. (in press).