. Cranberries; : the national cranberry magazine. Cranberries. Pioneer Press Photo Part of Beaver Brook Marsh, showing pump house on Beaver Brook dam inches to 10 inches, depending up- on t?ie weather conditions during the period of flooding, 10 inches being regarded as sufficient covei-- ing to protect the vines from the thaws that might occur during the winter months. (2) If insufficient ice has formed to protect the vines over winter, that is "ess than 10 inches, by the time the ice covering is per- mitted to settle on the vines addi- tional fresh water is added from the reservoir to b
. Cranberries; : the national cranberry magazine. Cranberries. Pioneer Press Photo Part of Beaver Brook Marsh, showing pump house on Beaver Brook dam inches to 10 inches, depending up- on t?ie weather conditions during the period of flooding, 10 inches being regarded as sufficient covei-- ing to protect the vines from the thaws that might occur during the winter months. (2) If insufficient ice has formed to protect the vines over winter, that is "ess than 10 inches, by the time the ice covering is per- mitted to settle on the vines addi- tional fresh water is added from the reservoir to build up the thick- ness of the ice until sufficient ice has formed. If the fresh water from the reservoir is low in oxy- gen at time of application it is aerated by a mechanical breaking up of the wat?r when parsing through the flood gates. Winter flooding is done in severe weather so that generally only one or two applications are necessary to pro vide the necessary 10 inches of ice. By following this program the oxygen content of the winter flood water has been kept above the danger point and leaf drop from this cause has been eliminated. Spring reflows were tested in a similar manner and when found necessary activated water was add- ed to keep up the oxygen content. However, to the disappointment and surprise of al' concerned, leaf drop persisted in the fall of the year and it was preceded by the appearance of black spots on the leaves of the current year's growth, which spots showed up in Septem- ber and early October. The lower leaves of the uprights were aff^ect- ed first, turning a rusty color and dropping within a few days. Dur- ing the falls of 1941, '42 and '43, from 25 to 50 per cent of the kaves dropped from the new up- rights and each year it was termi- nated by cold weathsr, usually about the middle of October. Oxygen deficiency having been e'iminated as a cause, suspicion rested upon the possible effects of using alkaline flood water and up- on the black spots wh
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