186 MASS. EXPERIMENT STATION BULLETIN 180. 



The temperatures here recorded were taken with Green minimum regis- 

 tering thermometers hung just over the vines bearing the berries. The 

 fruit was well colored when it underwent these temperatures. 



Several tests in both 1915 and 1916 showed that the temperature at 

 which freezing begins among ripened Early Black or Howes cranberries 

 is at or slightly above 22° F., no softening resulting from exposure to 23°. 



The records of minimum temperatures at the station bog from 1911 to 

 1916, inclusive, show that no temperature low enough to harm well-colored 

 berries appreciably occurred in any picking season of those six years. 



The results of these investigations show that, for bogs in warm or aver- 

 age locations that are flooded by pumping, it is unprofitable in the long 

 run to try to protect well-colored berries from frost, especially if the crop 

 is light. 



Fungous Diseases. 



These investigations were conducted, as in previous years, in co-opera- 

 tion with the Bureau of Plant Industry of the United States Department 

 of Agriculture, Dr. C. L. Shear and his assistant, Dr. Neil E. Stevens, 

 visiting the Cape several times during the season, the latter spending sev- 

 eral weeks at the station, and both giving sustained and aggressive atten- 

 tion to the more technical side of the work during a considerable period in 

 the growing season and throughout the fall and early winter. 



Table 1 is the season's record of the principal Bordeaux mixture spraying 

 plots, experiments with which have been described in previous reports. 

 None of these plots were treated this year, but the record is included here 

 to show the effects on the 1916 crop of the spraying done in former years. 

 Plots A, B, C, D and E were all sprayed in 1911, 1912 and 1913. The 

 treatment was continued on plots A, B and D in 1914, but was stopped 

 on C and E. It was further continued on A (entire plot) and on one-half of 

 B and one-half of D in 1915. Plots 15 and " 1913" were sprayed in 1913, 

 1914 and 1915. The whole of plot 15 has been treated with a complete 

 mixture of commercial fertilizers for several years, as was also the middle 

 part of A in 1913 and 1914. All the plots were picked with scoops as hereto- 

 fore. Where two checks were taken they were laid out on opposite sides 

 of the plot. The entire sections on which D and E are located, being 

 small, were used as checks. The fruit used in the storage tests was stored, 

 without separating, in quart cans with the covers on tight, but not sealed, 

 the berries being taken by hand from different parts of the picking crates, 

 all the crates picked being thus represented in the cans in most cases. 



