173 
AN INVESTIGATION OF SOME TOMATO 
DISEASES. 
By F. T. Brooks, M.A. and G. O. Searle, B.Sc. 
In January 1913 a paper(z) was published by the senior author 
and another giving an account of a disease of tomatoes, isolated 
from the fruit and stems of plants grown out-of-doors. 
This disease was identified by the late Mr Massee, as ‘‘ A sco- 
chyta citrullina C. O. Sm., the conidial form of Mycosphaerella 
citrullina Gross.’’ which was also the name given by this au- 
thority (9) to the fungus causing an epidemic disease (‘‘canker’’) 
of tomato stems in glass houses. In recent years this disease 
has been infrequent in English tomato houses, but it appeared 
in epidemic form in Holland during 1919 where it has been 
described by Schoevers (14) under the same name. 
During the years Ig1I to 1919 one of the writers collected 
various forms of fruit rots of tomatoes, and isolated the causal 
fungi. In August 1919 a detailed examination of these organisms 
was commenced and it seems desirable to place on record the 
results of this investigation obtained to date. During the early 
part of the joint investigation a few additional forms were 
collected by the junior author and included with the others. 
Certain cultures and herbarium specimens were also obtained 
from various sources, and it will be convenient to tabulate here 
the origin of all the material used. 
A. Phoma destructiva (Plowr.) C. O. Jamieson(7). This was 
an authentic culture obtained from the Department of Agri- 
culture, Washington, D.C., in the summer of 1916 through the 
kindness of Dr C. L. Shear. 
B. A culture of a pycnidial form of fungus from a rotten 
out-door tomato fruit collected at Merton, on September 17th, 
IQI5. 
C. A culture of a fungus showing both a pycnidial form of 
fructification and also spores of.an Alternaria type on the same 
mycelium, obtained from a rotten tomato fruit collected at 
Bristol on January 25th, 1916. This fruit was one of a number 
purchased at a shop. 
D. Colletotrichum phomoides (Sacc.) Chest. This was an au- 
thentic culture obtained from New York originally, but it was 
passed through tomato fruits and re-isolated in the autumn 
of IQI5. 
FE. A culture of a pycnidial form of fungus from a rotten 
