Table 1.

Cornus cultivars resistant to powdery mildew under field conditions 1998–2001.

Cornus species	Cultivar	Mean powdery mildew severity^z					Mean
Cornus species	Cultivar	1998	1999	2000	2001	2002	Mean
C. kousa	Agate	0 i^y	0 j	0 j	0 l	0.0 h	0
C. kousa	Autumn Rose	0 i	0 j	0 j	0 l	0.0 h	0
C. kousa	Big Apple	0 i	0 j	0 j	0 l	0.0 h	0
C. kousa	Blue Shadow	0 i	0 j	0 j	0 l	0.0 h	0
C. kousa	China Girl	0 i	0 j	0 j	0 l	0.0 h	0
C. kousa	var. chinensis	0 i	0 j	0 j	0 l	0.0 h	0
C. kousa	Dwarf Pink	0 i	0 j	0 j	0 l	0.0 h	0
C. kousa	Emerald Star	0 i	0 j	0 j	0 l	0.0 h	0
C. kousa	Gold Star	0 i	0 j	0 j	0 l	0.0 h	0
C. kousa	Lustgarten Weeping	0 i	0 j	0 j	0 l	0.0 h	0
C. kousa	Moonbeam	0 i	0 j	0 j	0 l	0.0 h	0
C. kousa	Satomi	0 i	0 j	0 j	0 l	0.0 h	0
C. kousa	Square Dance	0 i	0 j	0 j	0 l	0.0 h	0
C. kousa	Wolf Eyes	0 i	0 j	0 j	0 l	0.0 h	0
C. sericea	Cardinal	0 i	0 j	0 j	0 l	0.0 h	0
C. sericea	Isante	0 i	0 j	0 j	0 l	0.0 h	0
C. mas	Redstone	0 i	0 j	0 j	0 l	0.0 h	0
C. mas	Golden Glory	0 i	0 j	0 j	0 l	0.0 h	0
C. alternifolia	Pagoda	0 i	0 j	0 j	0 l	0.0 h	0
C. kousa	Trinity Star	0 i	0 i	____	____	0.0 h	0
C. kousa	Japanese Cornel	0 i	0 i	____	____	0.0 h	0
C. kousa	Milky Way	0.7 hi	0.5 hij	0 j	0 l	0.2 h	0.
C. kousa	Snow Flake	0.3 i	0.6 hij	0 j	0 l	0.0 h	0.2
C. kousa × C. florida	Stellar Pink	0.0 i	0.3 i	0.1 j	0.3 kl	0.5 h	0.2
C. kousa × C. florida	Celestial	0.7 hi	0.5 hij	0.1 j	0.3 kl	0.3 h	0.4
C. kousa × C. florida	Constellation	1.0 hi	0.5 hij	0.5 j	0.5 jkl	0.5 h	0.6
C. kousa × C. florida	Aurora	1.0 hi	1.0 fghij	0.5 j	0.8 jkl	____	0.8
C. florida	Fragrant Cloud	1.0 hi	0.4 ij	2.5 ghi	1.5 fgh	3.0 def	1.4
C. kousa × C. florida	Ruth Ellen	1.0 hi	1.0 fghi	2.4 i	2.5 cde	0.5 h	1.7
C. florida	Cherokee Brave	2.3 ef	0.5 hij	2.1 ef	2.9 cd	1.8 g	1.9
	LSD_(0.05)	1.1	1.1	0.9	0.8	1.1

↵^z Disease severity readings 1 = 1% to 10%, 2 = 11% to 25%, 3 = 26% to 50%, 4 = 51% to 75%, and 5 = 76% to 100% plant infection.
↵^y Statistical differences between cultivars are presented across Tables 1–2. Numbers followed by same letters in the same column are statistically similar at P = 0.05 according to t-tests between pairs of means calculated by Statistical Analysis Systems (SAS).