528 
Journal of Agricultural Research 
Vol. XI, No. IO 
PACIFIC COAST REGION 
As indicated by Table IV, the effective temperature for Fusicoccum 
putrefaciens at North Head, Wash., is very much greater than that at 
Middleboro, Mass., and only slightly less than that at Indian Mills, N. J., 
while the effective temperature for Glomerella cingulata is less even than 
than that in Maine. The ratio of temperature indices of the two fungi 
is accordingly much lower than that at any of the other stations. 
As still further emphasizing the difference in this region as regards 
temperature, it should be noted that daily normal temperatures above 
47° F. occur at North Head from April 15 to November 15, while the 
lowest normal temperature for the year is 41 °, and this is reached only 
for six days. So far as temperature is concerned, then, fungi having 
the temperature relations of Fusicoccum putrefaciens could grow through¬ 
out the year. 
The absence of high temperatures, combined with the long period of 
moderate or low temperatures, would indicate the suppression of fungi 
with relatively high temperature requirements and the correspondingly 
greater abundance of fungi with lower temperature requirements. On 
this basis one would be tempted to predict that when the cranberry 
industry becomes widely developed in the Puget Sound region there 
will be an increasing abundance of fungi, known chiefly from the north¬ 
ern portion of the present area of cranberry cultivation, possibly even 
the occurrence in epidemic amounts of fungi occasional or even rare in 
northern New England. Whether such predictions as to the develop¬ 
ment of fungi in the coastal region are justified or not, and even though 
the relation may be affected by growing different varieties in the several 
localities, it seems certain that the problem of fungus control will be 
quite different on the Pacific coast than in the eastern United States. 
CONCLUSIONS 
(1) The principal areas in the United States within which the cran¬ 
berry is grown commercially have more or less widely different climates. 
(2) This difference appears not only in the rainfall, length of growing 
season, and daily normal temperatures of these regions, but in their 
temperature efficiency, as indicated by a summation of daily mpan 
temperatures. 
(3) The fungi known to cause decay of cranberry fruits vary greatly 
in their temperature relations, as shown by their growth in pure culture 
on artificial media. 
(4) In general, the rate of growth of these fungi is reduced by low 
temperature, and most of them are unable to grow below 5 0 C., but 
Fusicoccum putrefaciens, the cause of endrot, is able to grow even at 
o° C. 
