PICKERING SPRAYS. 37 
from a barium-water spray containing 0.6 per cent of copper sulphate, 
or from standard Bordeaux, 4-4-50. The amount of bitter rot on 
the sprayed trees was so small that no definite control results were 
obtained. 
The data on the control of bitter rot by Pickering (A) and (C) 
sprays are rather limited, notwithstanding the fact that the experi- 
ments extended over three seasons. However, 0.5 per cent of copper 
sulphate present in either Pickering (A) or (C) spray gave indica- 
tions of satisfactory control of fungous diseases. 
The Pickering (A) spray is too caustic for use on the apple. While 
less caustic than Pickering (A) sprays, the Pickering (C) sprays 
seem to be more caustic than standard Bordeaux. It is apparent 
that these sprays are more caustic than standard Bordeaux, and can 
not be used on the apple. 
The barium-water spray was tested but one season on the apple. 
While the results were satisfactory with respect to the absence of 
injury, so little bitter rot was present on any of the trees that season 
that no definite control results were obtained. 
Additional experiments are necessary to determine whether a 
Pickering spray containing more limewater than is required in For- 
mula C and the barium-water spray may be safely and efficiently 
used as a fungicide on the apple. 
CRANBERRIES. 
Control of Fungous Diseases. 
- IN 1917. 
Two Pickering (A) sprays and two Pickering (C) sprays were 
tested on Centennial cranberries in 1917 at Piano ver Farms, N. J. 
The percentage of copper sulphate in the four sprays varied from 
0.32 to 0.62. In addition, Bordeaux, 2i-lJ-50, 2J-2J-50, and 
4-3-50, sprays were used. The first two Bordeaux sprays were 
taken for the purpose of comparing the different amounts of lime in 
a Bordeaux spray with the amount in a Pickering spray of the same 
copper sulphate content (0.64 per cent). 
The sprays were applied to small plats, 132 feet long and 8J feet 
wide, with a hand-pump sprayer, four times during the season, June 14 
(three or four days before full bloom), June 27 (10 days after full 
bloom), July 13, and July 30. Rosin-fish-oil soap, at the rate of 2 
pounds to 50 gallons, was mixed with all the sprays. The berries w sre 
picked September 15 and sorted for rot soon afterwards. 
