PRUNE AND CHERRY BROWN-ROT IN THE NORTHWEST. 5 
flour) were added to each 50 gallons of diluted commercial lime- 
sulphur. The soap was found very efficient as a spreader and 
sticker, but the paste was less satisfactory. 
Sprayings were made in the first orchard on March 17, when the 
buds were showing white; on March 24, when the blossoms were 
ready to open (PI. III, fig. 1); on April 8, after the blossoms had 
fallen; on May 1, when the husks were shed; on June 21; and on 
August 6, when the fruit was beginning to color. In the second 
orchard, sprayings were made on March 17, May 29, June 21, and 
August 6. 
On April 5 blossom infection was becoming prevalent and by 
April 8 had become serious. Notes were taken May 10 to 15 to 
determine the effect of the spraying in saving theset of fruit. Counts 
of the number of fruit spurs that had borne blossoms and the number 
of prunes still remaining were made on representative branches from 
the different plats. The first spraying on these plats was made with 
Bordeaux mixture and the second and third with self-boiled lime- 
sulphur. The results are shown in Table 3. 
TABLE 3.—Effect of early spraying upon the set of prunes. 
Prunes set Prunes set 
Sprayings applied. per 4,000 Sprayings applied. per 4,000 
spurs. spurs. 
So ee eee Sees aie 
First, second, and third ...-...-..-.-..- 292 || First and third -..............- a ae 143 
PESe AOE SPCOUES. 525.4. Soetoro oe oss oe BAS PINON 2c cme es es ee hw ot ee 69 
Second. J 24. iS es © |. SOURIS 369 ||..... GQ ee ec, er ee ee ee 86 
The results show that the sprayed trees had retained from two to 
five times as much of their fruit as the unsprayed. This differ- 
ence in set was somewhat evened up by a later drop, but records 
taken at harvest time showed that the average yield on plats that 
had received either the second or third spraying was more than 
donble that of the plats on which both these sprayings were omitted. 
Early in August spray injury became evrdent on the foliage of 
the lime-sulphur plats. The injury was as bad where the com- 
mercial solution had been diluted 1 to 50 as where diluted 14 to 50. 
It was estimated that about 15 per cent of the leaves were affected 
and that the total leaf area had been reduced about 10 per cent. 
Lime-sulphur also appeared to increase the fruit drop. The Bor- 
deaux mixture and self-boiled lime-sulphur plats were free from 
injury. 
Frequent showers occurred during the last three weeks of May, 
but the weather during the latter part of the summer was com- 
paratively dry. The occurrence of brown-rot was noted on some of 
the plats in the latter part of May, but there was no serious outbreak 
at any time during the summer. 
The prunes were harvested September 7 to 10. A count was made 
of the entire crop from the five trees of each plat. A crate of sound 
fruit was packed from each plat, shipped to Wenatchee, Wash., by 
ordinary express, and held without refrigeration till September 21 
