6 BULLETIN 368, U. S. DEPARTMENT OF AGRICULTURE. 
The spraying experiments were continued throughout the season. 
In addition to the dormant spray of March 17, the bud spray of 
March 24, and the calyx spray of April 8, a fourth application was 
made May 1 to 4, a fifth May 29, a sixth June 14, and a seventh 
August 6, about a month before harvest. 
The following spray materials were used: 
F1. Bordeaux mixture, 44-50. 
F2. Same as FI, but tin 2 pounds of resin-fishoil soap added. 
F8. Self-boiled lime-sulphur, 8-8-50. 
F4. Same as F3, but with 2 pounds of resin-fishoil soap added. 
F5. Same as F3, but with three-fourths pound of dry powdered arsenate of lead 
added. 
F6. Commercial lime-sulphur, 13 to 50. 
F7. Commercial lime-sulphur, 1 to 50. 
F8. Same as F6, but with 2 gallons of flour paste added. 
The flour paste was made by boiling 1 pound of flour in 1 gallon 
of water about half an hour, until a thick paste was formed. The 
resin-fishoil soap was purchased on the market in the East. It can. 
not be readily obtained on the Pacitic slope, but may be made up 
as follows: 
Resins 28 5S. Ae oes eee eee ee 5 pounds 
Potash lye, such as is sold for washing Purposes bene Seer 1 pound 
Bishiore 2 ee. > ee. eee ee eee 1 pint. 
Water. 3.2 aise ss ee es oe ee eee ee eee 5 gallons. 
The resin is dissolved in the oil by heating in a large kettle. After 
this has partially cooled, the potash is added, the mixture being 
slowly stirred and carefully watched to prevent its boiling over. — 
A part of the water is now added and the boiling continued till the 
mixture will dissolve in cold water. This will require about one 
hour. The remainder of the water is then slowly added and the 
mixture thoroughly stirred. The resin-fishoil soap was found very 
valuable in making the spray adhere to the fruit. It can not be 
used with commercial lime-sulphur. 
It was found that the fruit was covered better when a driving 
type of nozzle was used. None of the sprays used caused any 
injury. The second orchard adjoined the first. The trees were 
younger and had borne but a very light crop the previous year. 
Apothecia were of rare occurrence in this orchard in the spring. 
The prunes were harvested September 7 to 10. A count was made 
of the entire prune crop of the five trees of each plat. A crate of 
sound fruit was packed from each of the more important plats, 
the packed samples being stored in a noncooled orchard warehouse 
until September 14 and then shipped by express to Wenatchee, 
Wash. The figures in the last column of Table II show the percentage 
of brown-rot that had developed 12 days after harvesting. 
