PICKERING SPRAYS. 41 
Table 13. — Adherence of copper from various sprays to cranberry leaves (New Jersey). 
Plat No. 
Spray used. 
Copper sul- 
phate in 
spray used, 
Time be- 
tween 
spraying 
and gath- 
ering. 
Amount of copper. 
Parts per 
million 
(dry basis) 
Parts per 
million per 
0.1 percent 
I of copper 
sulphate 
in spray. 
8 (check). 
1 
2 
3 
4 
5 
6 
Pickering 
Pickering 
do... 
Pickering 
Bordeaux 
Bordeaux 
Bordeaux 
(A). 
(C). 
(A) , 
,4-3-50.... 
, 2|-li-50. 
,2|-2i-50.. 
Per cent. 
0.32 
.405 
.54- 
.64 
1.00 
.64 
.64 
Days. 
Picktring 
Pickering 
do... 
Pickering 
Bordeaux 
Bordeaux 
7 i Bordeaux 
8 (check) 
(A). 
(C). 
(A) 
, 4-3-50. . . 
2!-l|-50. 
21-21-50. 
.32 
.405 
.54 
.64 
1.00 
.64 
.64 
110.8 
140.2 
167.2 
166.2 
6S0.2 
407.8 
385.4 
32.6 
80.0 
100.7 
146.7 
131.3 
429.0 
138.0 
323.4 
60 
1918. 
1 Sal soda and rosin -fish-oil soap . 
2 ! Sal soda and fish-oil emulsion . . 
4 , Barium water and soap 
1 Pickering (C ) and soap 
Pickering (A) and soap 
7 (check). 
7 (check). 
1.0 
1.0 
.6 
Bordeaux, 4-3-50, and soap — 
Bordeaux, 4-2-50, and soap 
Bordeaux, 4-1-50, and soap 
Sal soda and rosin-fish -oil soap . 
Sal soda and fish- oil emulsion . . 
Barium water and soap 
Pickering (C ) and soap 
Pickering (A ) and soap 
1.0 
1.0 
1.0 
1.0 
1.0 
.6 
Bordeaux, 4-3-50, and soap . 
Bordeaux, 4-2-50, and soap . 
Bordeaux, 4-1-50, and soap. 
1.0 
1.0 
1.0 
1,200 
1,300 
1,100 
1,100 
1,400 
47 
1,600 
1,800 
1,600 
330 
380 
210 
630 
370 
17 
840 
1,000 
860 
120 
130 
183.3 
183.3 
233.3 
160 
180 
160 
33 
38 
35 
105 
61. 
84 
100 
86 
The leaves sprayed with. Bordeaux held a higher percentage of 
copper than those sprayed with the Pickering sprays, indicating that 
the extra lime of the Bordeaux spray, at least where rosin-fish-oil 
soap was used, is an important factor in increasing the adhesive 
properties of the spray on cranberry leaves. Possibly the copper of 
the Pickering sprays was more efficient as a fungicide per unit of cop- 
per present in the sprays than that of the standard Bordeaux spray, 
although the copper of the Pickering sprays did not adhere to the 
leaves as well as that of the Bordeaux sprays. The results for control 
of rot favor this view. The percentage of rotten berries (Table 12) 
does not speak particularly well for the sprays used on Plats 5 and 7, 
in spite of the fact that the leaves receiving these sprays retained 
the largest amounts of copper (Table 13). The results given in 
Table 13 show nothing concerning the distribution of the copper on 
the leaves or the form and efficacy of the copper on the leaves. 
IN 1918. 
One set of sprayed cranberry leaves was gathered for analysis for 
copper on June 25, directly after the sprays had been applied, and a 
