REPORT OF CRANBERRY SUBSTATION FOR 1915. 5 



The special tests with Bordeaux mixture, made up with varying pro- 

 portions of lime and copper sulfate, both with and without resin fish-oil 

 soap, to determine the causes for the root injury observed, as described 

 in previous reports, in connection with the spraying experiments have 

 been continued and extended, but have not yet advanced far enough to 

 give definite results. 



The writer visited the New Jersey cranberry growing section in July, 

 and examined bogs there which had been sprayed regularly with Bordeaux 

 mixture for several years. The last treatment of the season was being 

 apphed at the time. No indication of any such injury as that caused in 

 the spraying tests conducted by the writer at East Wareham was seen. 

 The reason for the difference in the results of this treatment on Cape Cod 

 and in New Jersey is not yet evident. It may be connected in some way 

 with the fact that on most New Jersey bogs sand is not used for a surface 

 mulch as in Massachusetts. Results seem to amply justify spraying with 

 Bordeaux mixture to control cranberry fungous diseases in New Jersey, 

 but this treatment is distinctly on probation on Cape Cod bogs. 



The disease spoken of as "Wisconsin false-blossom" in the 1914 report 

 of the substation was discovered this season on Metallic Bell and Bennett 

 Jumbo vines on a bog in Wareham, the infestation being very serious 

 with both varieties. These vines came originally from City Point and 

 Mather, Wis., and had been planted on the Wareham bog about four 

 years. Early in July this disease was reported by Miss Elizabeth C. White 

 as being present on Bennett Jumbo vines on a bog belonging to her father 

 near New Lisbon, N. J., these vines having come from Wisconsin in May, 

 1908. She stated that from 5 to 10 per cent, of the blossoms on these 

 vines were affected, and that the disease had also been found, to some 

 extent, on "Centennial vines in the same and adjoining bogs." Some 

 time afterward the writer visited these bogs and succeeded in finding a 

 few vines which showed plainly the effects of the disease, though the area 

 planted to the Bennett Jumbo variety had then been burned over. It 

 will be seen that evidence tending to prove the disease infectious is accumu- 

 lating. Special studies to determine this point have been started. Vines 

 of the Berlin Bell variety, which came originally from Wisconsin, growing 

 on bogs in Bourne and Plymouth, were examined carefully late in June, 

 but no trace of this disease was found upon them. 



The new disease, called the "blossom-end rot" in previous reports, 

 appeared to be distinctly less prevalent than usual this season, the fruit 

 of the Late Howe variety, as a rule, keeping unusually well. Dr. Shear 

 is continuing his technical investigation of the fungus which causes this 

 disease. 



Storage Tests. 



As a part of the fungous disease investigation, extensive storage tests 



were conducted during the fall and early winter to determine the effects 



of some of the factors affecting the keeping quality of cranberries. The 



descriptions of all of these tests that gave results of any considerable 



