40 
Journal of Agricultural Research 
Vol. XI. No. a 
Under ordinary commercial conditions of handling after picking, some¬ 
times 25 to 50 per cent of the Late Howe variety, which is one of the 
most seriously affected, will show endrot when screened and sorted for 
shipment two or three months after harvesting. In spraying experi¬ 
ments with Bordeaux mixture, carried on for several years in cooperation 
with the Massachusetts Agricultural Experiment Station at East Ware- 
ham, it has been found that in all cases there was a decided improvement 
in the keeping quality of the sprayed fruit and in some cases two or three 
times as much endrot developed in the unsprayed fruit as in the sprayed 
fruit. Details of the results of these experiments are given by the pub¬ 
lished reports of Franklin (3, 4, 5) and of the writer (6, 7). 
The following formula and dates of applications followed in the general 
treatment of other cranberry rots have been found effective in reducing 
loss from this disease: Bordeaux mixture (4-3-50) plus 2 pounds of 
commercial resin-fishoil soap. The first application should be made just 
before the blossoms open, the second just as soon as most of the fruit is 
set, the third about 10 days later, and the fourth when the fruit is about 
three-fourths grown. Even though spraying is practiced, in order to 
reduce the loss from endrot to the minimum, it is necessary to take all 
practicable precautions to pick and handle the fruit with care and place 
it in a cool, well-ventilated place as soon as possible. A low temperature 
is very essential in preventing the development of this rot in storage, as 
it has been found to develop to some extent at o° C. (32 0 F.). 
Whether or not it will be profitable to practice spraying for this disease 
will depend largely upon the amount of loss from decayed fruit usually 
sustained in any individual case. The greatly improved keeping and 
shipping quality of the sprayed fruit should, of course, be given due con¬ 
sideration in this connection. 
It may also be mentioned that under the conditions obtaining on the 
sprayed plots at the Massachusetts State bog, some injury to the vines 
is apparent and, associated with it except for the second year (2, 5), was 
a reduction in the amount of fruit produced. The effect on the vines is 
not a burning of the new foliage as in ordinary injury by Bordeaux mix¬ 
ture, but a reddening of the old foliage. The cause of this is not at 
present understood. No injury of this sort has been observed in New 
Jersey, where spraying with Bordeaux mixture has been practiced on the 
same bogs for 8 or 10 years in succession. Further investigation and 
experiments in Massachusetts are necessary to determine if possible 
whether this case is due to some peculiar local condition or combination 
of conditions of this bog, and if so, what they are. No injury to vines 
has been reported or observed on other Massachusetts bogs which have 
been sprayed with this mixture for several years in succession. 
