76 



MASS. EXPERIMENT STATION BULLETIN 402 



The Interrelation of the Different Factors 



In such a study as the present, in which accurately controlled experiment is 

 impossible and e\'idence even by observation must be slowh- accumulated, it is 

 not possible to evaluate very accurately the various factors concerned. Field 

 observation indicates that in determining the keeping quality of the general crop, 

 the May and June temperature is the most important of the factors considered; 

 distribution of rainfall and temperature in July and August come next; and the 

 size of the crop third. 



The charts, Figures 1 and 2, are designed to show the combined influence of 

 temperature during May and June and frequency of rainfall during July and 



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Figure 1. Temperature during May and June. Frequency of Rainfall during July and August 

 at East Wareliam, Massactiusetts, and tie Relative Abundance of Fruit Rots in Cranberries of 

 the Howes Variety in ttie Massachusetts Crops, 1912-1935. 



Black Circles — exceptionally large losses from fruit rots. 

 Shaded Circles — losses from fruit rots larger than normal. 

 Circles with F — fair keeping quality. 

 Unshaded Circles — slight losses from fruit rots. 



