312 
tures until April, 1953, when a sharp rise 
occurred with a rise in monthly mean tem- 
perature. After April, the number of 
conidia decreased again, as the monthly 
mean temperatures increased, and no 
conidia were found on mats that were 
AVERAGE NUMBER OF CONIDIA 
(HUNOREO THOUSANDS) 
ee leg 3 | 
NOV. OEC. JAN. 
SS fe ee 
Lt 
OcT. FEB. MAR. 
Ittinors NaTuRAL History SurvEY BULLETIN 
Vol. 26, Art. 3 
sampled in July. It is interesting to note 
in fig. 19 that the peak in conidium con- 
centration in December and a rise in 
April were preceded by months in which 
precipitation was above the annual mean. 
The time of the highest average per 
GB conioia 
(__] TEMPERATURE 
PRECIPITATION 
DEVIATIONS FROM 
THE ANNUAL MEAN 
PRECIP TEMP. 
(INCHES) ( °F.) 
+4+4+40 
+3-+-+30 
+2+ +20 
+1-+ +10 
2.5748 
= -10 
-2-+-20 
GS ee ee ey =3\ 4 <0 
APR. MAY JUNE JULY 
Fig. 19.—Monthly mean temperature and total precipitation, both shown as deviations from 
the annual means, and average numbers of conidia (per ml. of spore suspension prepared from 
three-disk sampling of each mat) obtained from 
fagacearum, October, 1952, through July, 1953. 
samples of mycelial mats of Endoconidiophora 
For temperature in October and for precipita- 
tion in May there were no deviations from the means. 
Table 16.—Average number per mat sample* and per cent germination of conidia taken 
from naturally occurring mats of Endoconidiophora fagacearum in five condition classes} in the 
10-month period October, 1952, through July, 1953. 
Crass I Crass II 
uM oO 5) -M OY o 
PRO Bigs nea ae gt Oa 
eo |V o5 ea |V as 
32 |bes| Bo [sas 
Zo un o> Zo no 
October. ... 84,800) 58 511,150) 15 
November. .| 1,079,675} 67 608,125) 23 
December... 122,600} 2 | 1,646,333) 4 
January 533,000} 12 | 550,433) 26 
February. . .| 19,442) 0 60,740) 10 
March... .-. | 413,786) 56 70,875} 13 
April | 197,708] 61 404°464| 34 
May....... | 488,385] 39 407,400) 6 
Tite. 2c. 152,000! 67 78,000} 15 
PEAIY Se gist. Sai Oo} — | oOo} — 
Crass III Crass IV Crass V 
ew oO vo Mu oO a o Lal © = o 
25 (88e) 5 |§5 2) 25 |S be 
eo |Uoan) goa |U om) go | oe 
oe Bae Be (Oo) Se 
Zo Mor! Zo | or| Zo | om 
ee Oo}. — o} — 
106,600| 10 | 29,875} 5 o| — 
1,056,000} 1 | 133,000) 0 o| — 
320,000} O | 741,120) 11 oo} — 
585,410; 4 | 76,453} 0 (21,250) 0 
25,688} 1 12,829} 1. | 3,724aa 
813,455} 40 135,583) 6 oOo} — 
266,527, 9 | 58,606) 1 Oo} — 
52,000; 9 | 40,914) 5 436) 15 
o} — | o} — o| — 
* Figures are calculated averages. Numbers of mat samplings are shown in table 15. 
+ Condition class I, immature; IT, 
mature; III, aging; IV, declining; V, deteriorating. 
i 
+ 
2 
3 
