PRUNE AND CHERRY BROWN-ROT IN THE NORTHWEST. 13 
SPRAYING EXPERIMENTS IN 1916. 
The experiments were continued in 1916 in the same orchards with 
the same spray materials. Sprayings were made on April 1, before 
the blossoms had opened, on April 21, after the blossoms had fallen, 
on May 12, and on June 15. About 25 per cent of the blossoms on 
the unsprayed trees became infected with the brown-rot fungus, and 
about 10 per cent of those on the sprayed trees were similarly in- 
fected. None of the spray materials caused distinct injury, but the 
cherries from the self-boiled lime-sulphur plat were smaller than the 
average and in some cases somewhat shriveled. The weather was 
showery during the picking season of the Napoleon variety, and the 
fruit cracked badly, but this trouble was greatly reduced on cherries 
that had received sprays containing soap. It was estimated that 
PERCENTAGE 
O-SLUIN LOT PERCENTAGE Of BROWN -ROT™ 
AT HALES, CROVURD TREATHENT = _agezeéRe HOLDING AND SHIPPING- 
i ranrrrnnnaan > 
45 (0 5 O o sO 
LG/OLLON 
BORDEAUX PUXTURLE FLOS 
4OSIN-FISTHIOIL SOF” 
SELF -BOULED LIE SULPHUR 
PLUS KOEIN-FIEHOL SAP 
UNTREATED 
MORK REPUBLICAN 
BORLDEHUK [UXT FLEES 
ROSIN -FISHOlL SQFl” 
SELF BLULLD LIME SULPHUR 
FLEES ROCOIN-FKSHHOIL SOP 
LIME SULIT 17° 30 
<O FO FO 4 
UNTREATED 
Fic. 9.—Development of brown-rot on sprayed and unsprayed cherries at harvest 
time and after holding; experiments of 1915. The results on Napoleon cherries as 
shown by the bars at the right were from fruit picked on June 17, stored at 41° F. 
on June 18, removed and shipped by express without refrigeration on June 27, re- 
ceived at Wenatchee, Wash., on June 29, and held in a warm laboratory till July 
The results on Black Republican cherries were from fruit that was picked on 
June 24, stored at 41° F. on June 25, removed and shipped by express without re- 
frigeration on June 27, received at Wenatchee, Wash., on June 29, and held in a 
warm laboratory till July 6. 
where soap was used not more than 25 to 30 per cent of the crop 
was injured, while on other trees fully 75 per cent of the fruit was 
affected. There was practically no brown-rot on the cherries at pick- 
ing time. A 10-pound box from each plat was held for observa- 
tion. The Napoleon cherries were picked July 8 and 5, the Black 
Republican July 6 to 10, and the Lambert July 14. The results of 
the shipping tests are shown in Figure 10. 
‘Considering the fact that scarcely any brown-rot could be found in 
the orchard, the contrast between the sprayed and the unsprayed 
fruit in the shipping tests is surprisingly great. 
SPRAYING EXPERIMENTS IN 1917. 
‘The experiments were continued in 1917, as in previous years. 
Sprayings were made on April 25, May 14, May 31, and June 22. On 
May 14 there was a serious blossom infection on the Napoleon and 
Black Republican cherries, and it was evident that the unsprayed 
