NOV. 29 * 
Varietal Resistance of Plums to Brown-Rot 
37i 
Table I .—Chlamydospore measurements of Sclerotinia cinerea 
Medium. 
Average 
length. 
Average 
breadth. 
Medium. 
Average 
length. 
Average 
breadth. 
Surprise plum. 
ft 
ft 
Longfield apple. 
ft 
ft 
l6. 22 
II. 24 
15.80 
IO. 81 
Newman plum. 
* 7 - 38 
12 . IO 
Soulard apple. 
i 5 - 30 
IO. 76 
Ocheeda plum. 
Harrison plum. 
l6. l8 
* 5 - 95 
II. 09 
10. 98 
Beerwort agar. 
14-05 
8.77 
From a comparison of these measurements with those given in Table II, 
it will be seen that they agree very closely with those obtained by other 
investigators in this country and are only slightly larger than those 
given for S. cinerea by European investigators. They also correspond 
closely to the measurements given by Aderhold and Ruhland for S. laxa 
found on apricots. 
Table II. —Spore and ascus measurements of the brown-rot fungus as given by various 
investigators 
FROM EUROPEAN SOURCES 
Fungus and investigator. 
Host. 
Chlamydospores. 
Asci. 
Ascospores. 
Sclerotinia cinerea: 
Saccardo (1886) 
Woronin (1900).... 
Aderhold and 
Ruhland (1905). 
Matheny (1913)... 
Sclerotinia laxa: 
Aderhold and 
Ruhland (1905). 
Cherry brown-rot: 
Westerdijk (1912).. 
Sclerotinia fructigena: 
Saccardo (1886). 
Woronin (1900)... 
Aderhold and 
Ruhland (1905). 
Matheny (1913).. . 
In culture.. 
JCherry... . 
\Various.... 
Peach and 
plum 
Apricot.... 
Cherry, 
{ Apple. 
In culture. 
Apple. 
15 to 17 by 10 to 12. 
12.1 by 8,8 to 13.2 
by 9.9 
17.5 to 24.2 by 11.2 
to 13.2 
13hy 9.2. 
13.8 by 9.95. 
14.4 by 10.8. 
16.1 by 10.8. 
25 by 10 to 12.. 
20.9 by 12.4 to 24.5 
by 13.2 
23.7 to 30.8 by 14.9 
to 16.5 
25 by 13. 
22.1 by 11.2, 
121.5 t <5 
149.9 b y 
8.5 ton.8 
158.4 to 
171.6 by 
7.9 to 8.5 
11.5 to 13.5 
by 5.2 to 
6.9 
13.2 to 16.8 
by 4.3 to 
5-2 
120 to 180 
by 9 to 12 
11 to 12.5 by 
5.6 to 6.8 
