10 BULLETIN 1252, U. S. DEPARTMENT OF AGRICULTURE. 
the unsprayed trees developed six to nine times as much rot as that 
from the trees receiving the best orchard treatment. 
SUMMARY OF SPRAYING EXPERIMENTS ON PRUNES. 
During the five years covered by the spraying experiments there 
was never a really serious outbreak of brown-rot on the fruit, yet 
PERCEN THEE 
 BOWN-ROT PERCENTACE OF BROW N-lOT- 
AT HARVEST CRCHAED TREATIIENT S-TER LIGHT RAYE WITHOUT (CE 
— a Se 
“oso i) JO 2O ZO #0 50 50 FO 
WX PUXTORE FL 
KOSIN-FLSIICIL SCA4P 
LLE BOMLD LIMESULS UR 
FLEES KOSIN-SFLSHIOIL SO 
AS ABUE BUT LAST 
DPPALICATION OTTED\ NONE (VEL OP 
LIME SUL/ VIR 7270 SO 
FLEES GASLIN 
WVTIRZEATED 
—_ 
es) 
Fic. 4.—The effect of spraying upon the development of brown-rot on Italian Prunes 
in the orchard and after harvest; experiments at Salem, Oreg., in 1919. The bars 
on the right show the results from a shipment without ice which was received in 
Wenatchee, Wash., September 18, and held in cellar storage till September 23. 
there was always considerable loss from the disease, especially 
in the orchards receiving the least care. The fruit from the un- 
sprayed plats of the experimental orchards never had as much as 
eee ROEN TAGE OF BROWN -KO7- 
LUN LOT PE: TAGE OF r 
AT HARVEST ORCILYED TREATMENT PFTER. SHIPPIENT- 
SS SS SL 
4$ JO $& O 2 7) 7 a 
STAPLLAIN . : 
PODEALX MUTE FLlh 
LON SLSHICUL SC29P 
LIME SUF Tle 27° SO 
FLLS COPSLIV 
UNI REATEDP 
—ICEN (PETITE) 
SLLF BOUMLD LIME SULTS leg 
LAS KOSS LSU. SO 
AS ABOVE BUT LAST 
WYLICAITION DUT TEP 
SULS WR LLET ZO-ZS-/7 CL) 
SUL/ Mle LUST BO-O-43 CT) 
BORDLE ALIX OO357 | Apres 
BORDEAUX DUST B 
Gs) CSNTIREAVTED 
Fic. 5.—Italian and Agen (Petite) Prune experiments at Salem, Coed: in 1919, The 
shaded bars at the right show the result of a shipment to W enatchee, Wash,, in a 
pony refrigerator, the fruit being held in the refrigerator under ice till September 
23. The total length of the bars shows the total rot after the cool storage had 
been followed by two days of warm storage. 
10 per cent of rot at harvest time, but a comparison of the brown-rot 
on the sprayed fruit with that on the unsprayed shows that the 
spray applications were very efficient in holding the disease in check. 
