12 BULLETIN 1434, U. S. DEPARTMENT OF AGRICULTURE 
Table 2 shows that both unsprayed bogs produced very poor berries 
suggesting that continuous spraying greatly improves the keeping 
quality of the fruit while reflowing tends to increase the development 
of rot. At the same time, however, it is to be noted that the three 
bogs represented m this test being widely separated were not exactly 
comparable. J 
In another experiment in 1922, berries of the Bennett Jumbo vari- 
ety from a bog not sprayed in previous years were used. One plot 
received two applications of Bordeaux mixture (hook stage and after 
blossom) and the other was not sprayed. The results ofthe storage 
tests are given in Table 3 . 
Table 3.— Percentage of rot developing in storage in Bennett Jumbo cranberries in 
1922 from bog not sprayed in previous years 
Date of examination of storage materia] 
Sprayed 
with 
Bordeaux 
mixture 
June 15 
and 
July 20 
Check, 
not 
sprayed 
Nov. 7 
17 
30 
18 
Dec. 1 
38.1 
Table 3 shows that a bog that was not sprayed year after year 
produced berries of poor keeping quality. The applications of Bor- 
deaux mixture as made in 1922 served to improve the keeping qual- 
ity to some extent, but the results were not entirely satisfactory. 
The year 1922 was on the whole a good keeping year for commer- 
cial berries. Observation showed that more trouble developed in 
such varieties as Searls and Bennett than in McFarlin and Howes, sug- 
gesting that under the local conditions there may be considerable 
variation m the susceptibility of different varieties to fungous rots. 
As a result of the experiments and observations of the first sea- 
son it seemed apparent that spraying with Bordeaitx mixture as a 
rule reduced storage losses. Bogs sprayed year after year with Bor- 
deaux mixture produced berries this season which kept well, while 
those from some bogs not sprayed in past years developed a much 
greater degree of rot. Certain varieties exhibited keeping qualities 
superior to others. It became clear that future studies should be 
along the lines of determining the necessary number of applications 
ot Bordeaux mixture, the proper times to make these applications, 
and more intensive control work with varieties appearing to be most 
susceptible to rot-producing fungi. 
EXPERIMENTS TO DETERMINE TIME AND NUMBER OF APPLICATIONS OF 
BORDEAUX MIXTURE 
The results obtained in an extensive series of tests with various 
combinations m the time of spraying are given in Tables 4 to 9, 
inclusive. 
