CRANBERRY STATION. 151 



produced 909 barrels of unusually sound berries which sold for about 

 $7,300. 



The spring and early summer of 1920 on the Cape were wet and back- 

 ward. Because of the rains, there were a few hundred acres from which 

 it was impossible to remove the winter water early enough to grow a crop, 

 the importance of adequate drainage thus being emphasized again. 



In 1920 most of the Cape bogs bloomed very heavily and so aroused 

 the anticipation of a record crop, but there was a marked and widespread 

 failure to set fruit, and the total Cape yield was only about 277,000 barrels. 

 The weather and blossom conditions and the fruiting failure paralleled 

 those of 1916,' except that thin vines were not relatively more fruitful. 



Fungous Diseases. 

 The " Rosebloom" Disease. 



As the "rosebloom" disease (Exobasidium oxycocci) had greatly reduced 

 the crop of Howes and McFarlin berries on the station bog for three suc- 

 cessive years, treatment bj^ flooding was tried in 1919. The winter flood 

 was let off March 23, and the shoots enlarged by the disease became 

 partly gro^vTi and abundant by May 25 when the first reflooding was done. 

 The water was held sixty hours, the weather being mostly clear. The 

 diseased shoots collapsed and dried up wdthin a day after the flood was 

 let off. More such shoots grew later and were killed by the mid-June 

 flowage mentioned below. Little evidence of the disease appeared on the 

 bog the rest of the season, and comparatively few of the enlarged shoots 

 grew in 1920, the treatment thus seeming to have been largel}^ successful. 

 The early destruction of the diseased growths probably reduced the spore 

 production of the fungus greatly, and thus lessened the infection of the 

 new axillary buds. 



Wisconsin False Blossom. 



False blossom (the Wisconsin disease) has previously been reported - as 

 found on five Cape bogs, the infestation being due to planting Wisconsin 

 vines in every case. All these infestations have been wiped out by de- 

 stroj'ing the infected vines. In the fall of 1919 six heretofore unnoticed 

 infestations were found by Dr. Stevens of the Bureau of Plant Industry 

 and the writer on HoUiston ^ vines in Pembroke, Carver and Wareham. 

 The histories of the plantings strongly suggested that all the infections 

 had had a common origin on a bog in Wareham, where the variety had 

 been kno^vn as "Small's No. 1." Holliston vines on ten other bogs, in 

 Plymouth, Carver, Middleborough, Lakeville, South Hanover and Hollis- 

 ton, the planting in the last-named to^\•n being the original one of the 

 variety, showed no sign of the disease. This suggests that the Holliston 

 variety, as grown on the Cape, may be a double one, the infected strain 



1 Mass. Agr. Expt. Sta., Bui. No. 180, 1917, p. 184. 



2 Mass. Agr. Expt. Sta., Bui. No. 160, 1915, p. 100; and Bui. No. 168, 1916, p. 5. 



3 This variety is widely known as "Mammoth" or "Batchelder," but the name of its place of 

 origin seems preferable. 



