Oct. 1, 1925 
Sclerotinia Species Causing Decay of Vegetables 
619 
surfaces, and the specimens were held in large sterile moist chambers. 
Vigorously growing mycelium a week old on a small piece of potato- 
dextrose agar was used as inoculum. The results of some of the more 
important experiments are summarized in Table V. 
Table V.— Summary of cross-inoculation studies with Sclerotinia spp. 
S. LIBERTIANA 
Source of culture 
| Asparagus 
shoots 
Bean pods 
Beetroots 
Carrot root 
Celery stalks 
i Cucumber 
fruits 
Lemon fruits 
Lettuce heads 
Parsnip roots 
Pea pods 
Potato tubers 
Sweet potato 
roots 
Turnip roots 
Tomato fruits 
Bean pods___ 
°+ 
+ 
(?) 
4 - 
4 - 
+ 
4- 
4 - 
4- 
4- 
6 — 
4 - 
+ 
4 - 
Carrot roots_____ 
+ 
+ 
(?) 
+ 
+ 
+ 
4 - 
+ 
+ 
4 - 
— 
4 - 
+ 
+ 
Celery stalks... 
+ 
+ 
(?) 
+ 
+ 
+ 
+ 
+ 
4 - 
+ 
— 
+ 
+ 
+ 
Lemon fruit_ 
+ 
+ 
4 - 
+ 
+ 
+ 
+ 
+ 
4- 
4 - 
— 
4 - 
+ 
4 - 
Lettuce heads_ 
+ 
+ 
(?) 
+ 
+ 
+ 
4 - 
+ 
+ 
+ 
— 
+ 
+ 
4 - 
Parsnip roots__ 
+ 
+ 
+ 
+ 
+ 
4 - 
4 - 
+ 
+ 
— 
4- 
+ 
+ 
Pea pods_ 
+ 
+ 
— 
+ 
+ 
4 - 
+ 
4 - 
4 - 
+ 
— 
+ 
4 - 
+ 
Potato stem___ 
+ 
+ - 
+ 
4 - 
+ 
4 - 
+ 
4 - 
+ 
+ 
— 
+ 
+ 
4 - 
Salsify roots_ 
+ 
+ 
+ 
+ 
+ 
+ 
+ 
4 - 
4 - 
4 - 
— 
+ 
4 - 
+ 
Strawberry fruit... 
+ 
+ 
— 
+ 
+ 
+ 
4 - 
+ 
+ 
4 - 
— 
+ 
+ 
4 - 
Sweet potato roots_ 
+ 
+ 
+ 
+ 
4 - 
+ 
+ 
+ 
4 - 
4 - 
— 
+ 
+ 
+ 
Turnip roots_____ 
+ 
+ 
(?) 
+ 
4 - 
+ 
4 - 
+ 
+ 
+ 
+ 
4 - 
S. INTERMEDIA 
Salsify root..... 
4- | + 
+ 
+ 
+ 
4- 
4- 
+ | + 
4- 
+ 
+ 
S. MINOR 
Lettuce heads-- - 
+ 
4 - 
+ 
+ + 
+ 
+ 
+ 
+ 
4 - 
+ 
+ 
4 - 
Sunflower plant__ 
4 - 
+ 
+ 
+ + 
4- 
+ 
4 - 
+ 
+ 
— 
+ 
+ 
+ 
S. RICINI 
Ricinus plants___ __ _ _ 
+ 
+ 
(?) 
+ 
(?) 
4- 
+ 
+ 
+ 
4- 
4- 
4- 
•+=result positive. 
b —=result negative. 
Twelve strains of the S. libertiana type which were isolated from 
different hosts were used, together with one strain each of S. interme¬ 
dia and S. ricini and two strains of S. minor . These cultures were 
used to inoculate nine different hosts that are commonly affected with 
Sclerotinia decay. In addition, potato tubers, beet roots, and tomato 
and lemon fruits were inoculated, because the two former commodities 
do not seem ever to have been found on the market affected with 
Sclerotinia decay, while the two latter fruits were selected because 
of their relatively high acid content. 
As shown in Table V, practically all of the strains obtained from 
the various host plants are pathogenic to those hosts commonly 
found attacked by Sclerotinia. Failure to get infection of the Irish 
potato was consistent. Both young and old tubers of several dif¬ 
ferent varieties have been inoculated, but no tuber has ever shown 
even the slightest decay that could be ascribed to Sclerotinia infec¬ 
tion. A culture isolated* from potato plants in the field also proved 
negative to the tubers. These results are contrary to those obtained 
by Bisby (5), who inoculated potato tubers with a strain of Sclero- 
' CEREAL 
LIBRARY 
INV &TIBAHOMt, 
