Jan. 22,1917 
Temperature Relations of Apple-Rot Fungi 
159 
Table} IV .—Results of germination experiments with various apple-rotfungi. a 
Fungus. 
Germination at io° 
C. after — 
Germination at 5 0 
C. after— 
Germination at o° 
C. after — 
10 days. 
31 days. 
10 days. 
31 days. 
22 days. 
31 days. 
A Iternaria sp. 
+ 
+ 
+ 
+ 
_ 
+ 
Aspergillus niger . 
— 
— 
— 
— 
— 
— 
Botrytis cinerea . 
— 
+ 
— 
+ 
— 
Cephalothecium roseum . 
— 
+ 
— 
+ 
— 
— 
Fusarium radicicola . 
_ 
+ 
_ 
+ 
_ 
_ 
Glomerella cingulata . 
+ 
+ 
+ 
+ 
— 
— 
Penicillium expansum . 
+ 
+ 
+ 
+ 
+ 
+ 
Pestalozzia funerea . 
— 
+ 
— 
+ 
— 
— 
Sclerotiniacinerea (apple)...... 
+ 
+ 
+ 
a 4 - indicates germination; — indicates failure to germinate. 
There was little contrast between the germination at io° and that at 
5 0 . At both these temperatures Alternaria sp., Glomerella cingulata , and 
Penicillium expan¬ 
sum had germinated 
by the end of 10 
days and all of the 
fungi but Aspergil¬ 
lus niger by the end 
of 31 days. At o° 
none of the fungi 
but P. expansum 
had germinated at 
the end of 22 days 
and only the species 
of Alternaria, Bot- 
rytis, and Scleroti- 
nia were added to 
this by the end of 
31 days. 
At io° Alternaria 
sp., Botrytis cinerea , 
Fusarium radici¬ 
cala, Penicillium ex¬ 
pansum , and Sclero- 
tinia cinerea were fruiting by the end of the month, and Cephalothecium 
roseum had made a good growth, but Glomerella cingulata and Pestalozzia 
junerea had produced colonies but a few millimeters in diameter. After 
31 days at 5 0 the species of Alternaria, Botrytis, Penicillium, and Sclero- 
tinia used were fruiting, while the colonies of Cephalothecium, Fusarium, 
Glomerella, and Pestalozzia had barely made a start. At o° P. expansum 
67907°—17 - 3 
temperature (^Centigrade) 
Fig. 24.—Graph showing the comparative growth of the different rot fungi 
on corn-meal agar petri dishes, first experiment. The curves show the 
average daily increase in diameter during* the first six days of the ex¬ 
periment. 
