- 6 - 
says recent findings in So. America are believed result of 
introduction from Europe. 
p. 6 S olanum v illosi s i mum and S. album , Nic andra physalodes, 
Solanum chacoense , S. commersonii , S. j amesii , S. ncd iflorum , 
and S. v illosum among hosts listed. 
(2) Bell, R. H. and Hartman, R. E. 
1939 Potato Wart in Pennsylvania. pp. 1-8, map. Mar. 1, 
1939. (mimeographed) 
Historical summary of wart, surveys, quarantine and 
especially treatment work in Pa. Quarantine removed from 
some areas after annual tests for 5 years showed freedom 
from wart. "Since the inception of the eradication program 
in 1934, a total of 3,911 gardens in the 21 treated areas 
have been planted to susceptible potatoes and not a single 
new infection has been uncovered." From investigations and 
observations conclude that soils with temperatures of 6C° to 
64° F. favor development of wart and with 70° to 72° F. 
inhibit development. Wart confined to areas with growing 
seasons of 140 days or less. Without cultivation disease 
lives in soil 20 years; with fallow or semi- fallow culture 
without host plants is starved out in 10 years. Expect to 
eradicate the disease in Pa. by the use of 2,000 pounds of 
Ammonium Sulfo-Cyanate per acre on generally infected soil 
and of 2 quarts of Mercuric Chloride (1-1,000) per square 
foot for small infected spots. 
(3) Curtis, K. M. 
1921 The life history and cytology of Synchytrium endobioticum 
(Schilb.) Perc, the cause of wart disease in potato. Phil. 
Trans. Roy. Soc. London, Ser. B, 210: 409-478. 1921. 
An illustrated, detailed study of the organism. 
(4) Cuthbertson, W. 
1915 Wart Disease of Potatoes. Gard. Chron. 57: 97. Feb. 
20, 1915. 
Wart said to have teen figured and described in Journ. 
of Hortic, of Dec, 15, 1898, by G, Abbey (in England). His- 
torical and general information, immune vars., etc. 
(5) Dix, W. and Kuglmorgen 
1932 Untersuchungen uber die deimung der Dauersporangien von 
"Synchytrium endobioticum. " (Investigations on the germin- 
ation of the resting sporangia of Synchytrium endobioticum. ) 
Pflanzenbau, Pflanzenschutz u. Pflanzenzucht 9: 209-16. (Ab- 
str. in R.A.M. 12: 322, 1933). 
Potato extract from either susceptible or immune var- 
ieties hastens germination. "The highest percentage of germin- 
ation after four months in this series (82) was obtained in 
a 6 percent solution of expressed leaf juice of the resistant 
