ISO 
Journal of Agricultural Research 
Vol. VIII, No. 4 
The temperatures used were not high enough to determine the maxi¬ 
mum for most of the fungi. Neofabraea malicorticis refused to grow at 
30° and Penicillium expansum made but a scant growth at that tempera¬ 
ture. 
orchard-infected fruit 
Experiments were also made with Sphaeropsis malorum and Glomerella 
cingulata , using rots that were produced by natural infection instead of by 
artificial inoculation. The condition of the apples at the beginning of the 
experiment is shown in Plate 1. The rots at this time were mere specks, 
the largest being only a few millimeters in diameter, and most of them 
much smaller. The records are based on the increase in the diameter of 
the rot, the original diameter being subtracted where the initial rot was 
of measurable size. The blackrot experiments were made on Grimes 
Golden and Northwestern Greening apples. The results were so uniform 
with the two varieties that one summary is given for both. The bitter- 
rot experiments were on Ben Davis apples from Virginia. Part of the 
apples were placed in large moist chambers, the others in wire baskets. 
About a peck of apples was used at each temperature for the open pack¬ 
age and about half as many in the closed moist chambers. The air in 
the moist chambers was kept practically saturated. The apples in the 
open packages were exposed in air that ranged from 50 to 70 per cent 
relative humidity. The results are given in Tables I and II. 
Table I .—Results of natural infection with Sphaeropsis malorum—Experiment started 
on September ij, igi$ 
Temperature. 
Container. 
Diameter of rot (in millimeters) after— 
10 days. 
24 days. 
38 days. 
C 
20 to 26, averaging 21.... 
IS . 
10. 
/Open basket.. 
/Closed chamber. 
/Open basket. 
1 Closed chamber. 
Open basket. 
23.7 
27. 2 
6.6 
7.8 
1. 1 
4. 2 
0 
23.7 
4 i -5 
24.1 
27-5 
5-5 
7.8 
8 
3 °. 0 
14.4 
13 - 1 
10. s 
(Open basket. 
/Closed chamber. 
