Disease Ratings of Apple Scab Resistant Cultivars

Table of apple scab resistant cultivars' susceptibility to other diseases
(Source of information and credits provided at the bottom of the page.)

Apple Cultivars	Apple scab susceptibility rating^z	Cedar apple rust susceptibility rating^z	Quince rust susceptibility rating^z	Fire blight susceptibility rating^z	Powdery mildew susceptibility rating^z
Britegold	VR	HS	HS	MR	R
Crimson Crisp (Co-op 39)	VR	HS	HS	?	HS
Dayton	VR	R	?	?	R
Enterprise	VR	VR	?	?	R
Freedom	VR	S	?	MR	R
Gold Rush	VR	HS	?	?	S
Jonafree	VR	HS	S	S	R
Liberty	VR	VR	S	MR	S
Macfree	VR	VR	HS	MR	S
Moira	VR	R	HS	S	S
Murray	VR	R	HS	MR	?
Nova Easygro	VR	VR	?	MR	S
Novamac	VR	VR	HS	?	?
Prima	VR	HS	HS	MR	R
Princess (CQR12T50)	VR	HS	HS	?	S
Priscilla	VR	VR	HS	MR	R
Pristine	VR	S	?	?	S
Redfree	VR	VR	R	S	S
Richelieu	VR	HS	S	?	?
Scarlet O'Hara (Co-op 25)	VR	HS	S	?	S
Sir Prize	VR	HS	HS	MR	R
Sundance (Co-op 29)	VR	VR	R	?	HS
Trent	VR	R	HS	MR	R
Williams Pride	VR	S	?	?	R

^zVR = very resistant. No control needed. (Very few cultivars in this category for any disease.)
MR = Moderately resistant. Control only needed with fire blight susceptible rootstocks or under high disease pressure.
R = 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:

van der Zwet, T., and S. V. Beer. 1995. Fire blight - Its nature, prevention, and control. USDA Agriculture Information Bulletin Number 631.

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.