436 
F. D. HEALD AND R. A. STUDHALTER 
time were generally below the optimum for spore expulsion, the 
highest activity was not reached until the month of May. There 
was a decline in spore expulsion during the months of June and 
July, but there was abundant expulsion in August, September and 
October. In November, with the return of unfavorable temperatures, 
the perithecia ceased to expel spores. This seasonal relation is 
represented graphically in Fig. 2. 
Table VII 
Records for Ascospore Traps, Martic Forge, Pa., Spring and Summer, igij 
Rainfall 
Temperature 
Percentage of 
Traps Showing 
Date 
Amount, Inches 
Max. 
Min. 
Expulsion 
1.29 
67 
53 
2.0 
\\ 15 
.92 
61 
56 
6.0 
62 
DO 
49 
6.0 
•O3 
Do 
52 
0 
347 
65 
30 
DO.O 
31 
.04 
69 
49 
0 
Apr. 3 
.10 
74 
39 
0 
5 
•23 
59 
40 
19.6 
14 
1.78 
57 
51 
65-3 
I-I5 
59 
45 
0 
" 28 
2.33 
58 
45 
98.0 
" 29 
.07 
49 
35 
4.0 
May 15 
.11 
74 
42 
2.0 
" 16-17 
•74 
84 
49 
98.0 
" 21 
.27 
64 
50 
58.0 
" 29-30 
.69 
75 
44 
95-0 
June 19-21 
•34 
92 
52 
88.0 
" 23 
.26 
75 
61 
96.0 
" 27 
•37 
lOI 
77 
100.0 
July 2 and 5 
1.97 
97 
66 
100.0 
" 9 
•59 
69 
63 
100.0 
" 17 and 20 
•13 
89 
57 
96.0 
Aug. I 
2.68 
87 
68 
100.0 
6 
1-37 
82 
64 
98.0 
" 10 
I-I3 
97 
70 
98.0 
" 22 
•17 
73 
58 
100.0 
" 29 
.30 
79 
68 
100.0 
Sept. 7 
.67 
92 
69 
86.0 
" 12 
.09 
67 
56 
68.0 
" 17-18 
.19 
75 
54 
82.0 
" 20-21 
2.37 
80 
57 
92.0 
" 29 
.02 
68 
55 
0 
Sept. 30-Oct, 2 
1.63 
77 
50 
100.0 
Oct. II 
•67 
68 
56 
94-7 
" 19 
1.05 
57 
46 
85.0 
" 20 
.15 
68 
42 
1.4 
" 25-26 
1.04 
61 
50 
93-3 
Nov. 8-9 
.91 
58 
33 
83.3 
" 15-16 
.83 
40 
25 
0 
