June 1,1925 Susceptibility of Plants to Attack by Citrus-Scab Fungus 1089 
Table I .—Relative susceptibility of some rutaceous plants to citrus scab —Contd. 
Range of susceptibility 
Botanical name 
Common or variety 
name 
! 
No in¬ 
fection 
ob¬ 
served 
Very 
rarely 
at¬ 
tacked 
Slightly 
suscep¬ 
tible 
Moder¬ 
ately 
suscep¬ 
tible 
Very 
suscep¬ 
tible 
Family Rutaceae—Continued. 
Subfamily Citratae—Continued. 
Tribe Citreae—Continued. 
Subtribe Citrinae—Con. 
C. grandis Osbeck_ 
Do_ 
Royal grapefruit_ 
X 
Triumph grapefruit... 
Walters grapefruit_ 
X 
Do _ 
X 
Do_ _ 
Chinese pummelo__ 
X 
Do_ 
Pink pummelo__ 
X 
Do . 
Sour pummelo. __ 
X 
Do_ _ 
Common shaddock. _ 
X 
Do. (?)... _ 
Cuban shaddock_ 
X 
C. aurantium Linn... 
Bergamot orange. 
X 
Do 
Bitter sweet orange . 
X 
Do_ 
Willow leaf bitter 
sweet orange _ 
X 
Do__ 
Myrtle leaf orange 
X 
Do_ 
Otaheite orange_ 
X 
Do 
Sonr orange 
X 
C. sinensis Osbeck. . 
Chamoudi orange. 
X 
Do_ 
Florida Seedling or¬ 
ange _ 
X 
Do_ 
Enterprise orange_ 
X .. 
Do_ 
Homosassa orange_ 
X 
Do .. _ 
Jaffa orange_ 
X 
Do_ _ 
Lamb orange_ __ 
X 
Do_ 
Lne ora,n ere 
X 
Do_ 
Maltese or a,nee 
X 
Do_ 
Mediterranean sweet 
orange_ 
X 
Do_ 
Norris early orange_ 
Parson Brown orange _ 
Pineapple orange_ 
X 
Do_ 
x 
Do_ 
X 
Do_ 
Ruby orange_ 
x 
Do_ 
Surprise orange. 
x 
Do_ 
Valencia orange_ 
X 
Do__ 
Washington navel or¬ 
ange _ 
X 
C. nobilis Lour.. 
King orange_ 
X 
C. nobilis deliciosa Sw_ 
Clementine orange _ 
X 
Do_ 
Cleopatra mandarin... 
Dancy tangerine_ 
X 
Do.. 
X 
Do_ 
Oneco tangerine_ 
X 
Do_ 
Mandarin_ 
x 
C. nobilis unshiu Sw__ 
Satsuma.. 
X 
C. mitis Blanco.. 
Calamondin... 
X 
C. (Papeda) hystrix 
D. C. 
Do_ 
Pointed leaf papeda 
X 
Round leaf papeda_ 
X 
C. webberi Wester_ 
x 
Microcitrus australa- 
Australian finger lime. 
X 
sica Sw. 
Subfamily Toddalioideae— 
Tribe Toddalieae— 
Subtribe Toddalinae— 
Toddalia lanceolata 
X 
Lam. 
affected with scab on several occasions; 
while the Persian, which is very similar 
to the Tahiti, the Mexican, the Thorn¬ 
less, and the Woglum lime, appear to 
be immune. 
Most grapefruit (Citrus grandis) 
varieties are only moderately affected by 
scab. The Hall appears to be more 
susceptible than most varieties, while 
the Marsh seems less likely to be 
seriously attacked, but this difference 
is not sufficiently great to justify 
separate spray schedules for these two 
varieties. The apparently immune 
Royal and Triumph varieties are re¬ 
garded as hybrids of orange and grape¬ 
fruit. On the other hand, the Leonardi 
variety, which possesses a number of 
the distinctive growth features of the 
Royal and Triumph, and which is con¬ 
sidered by some to be an orange and 
grapefruit hybrid, is about as sus¬ 
ceptible as most commercial varities of 
grapefruit. . The pummelos are about 
as susceptible as most grapefruit. 
Scab has not been observed on the 
Cuban shaddock (considered Jby some 
to be a hybrid), a fact which increases 
