THE INFLUENCE OF TEMPERATURE ON THE GROWTH 
OF ENDOTHIA PARASITICA 
Neil E. Stevens 
In an earlier paper (4) the writer discussed the influence of certain 
climatic factors on rate of vegetative growth and production of 
ascospores in Endothia parasitica (Mur.) And. and And. From the 
data then available it was concluded that the rate of lateral growth of 
cankers on Castanea dentata (Marsh) Borkh. was directly dependent 
on the amount and duration of temperatures favorable for growth and 
apparently unaffected by the amount or frequency of rainfall. Asco- 
spore production on the other hand seemed to be dependent chiefly 
on the presence of abundant moisture. The data on which these 
conclusions were based were obtained from observations made at a 
series of stations extending from Concord, N. H., to Charlottesville, 
Va., during the summers of 1914 and 191 5. 
Although it has been necessary to abandon several of the stations 
because of the increasing abundance of the chestnut blight, observa- 
tions have been continued in six localities. The results seem to 
warrant a brief statement. As the methods employed have been 
fully discussed in the earlier paper they need not be considered here. 
Rate of Lateral Growth 
The abundant rainfall of the summer of 191 5 resulted in the 
production of ascospores on practically all the inoculations at every 
station, consequently no further data on this point could be obtained. 
Table I 
Lateral Growth of Cankers of Endothia parasitica in Various Localities 
Locality 
Elevation 
(in Feet) 
Year Ending 
1916 
Centimeters 
Concord, N. H 
Amherst, Mass. (two stations) 
Woodstock, N. Y. ....... 
Washington, D. C 
Charlottesville, Va 
711 (900) 
222 
1,000 
112 (400) 
854 
May 18 
May 22 
May 17 
May 24 
May 4 
April 8 
14 
15 
17 
15 
21 
23 
112 
