PRUNE AND CHERRY BROWN-ROT IN THE NORTHWEST. i ii 
A summary of the results of the five years’ test on this point is 
brought out in Figure 6. It will be seen that the sprayed fruit had 
only about one-third as much brown-rot at harvest time as the un- 
sprayed and that it developed about one-fourth as much as the 
unsprayed in shipping and holding tests. 
The application a few weeks before picking time has been par- 
ticularly important in the control of brown-rot. This fact is brought 
out in Figure 7, which gives a summary covering this phase of the 
spraying results. It will be seen that approximately half the brown- 
rot control was due to 
this late application.  ZZewa-cor TREATMENT PERCENTAGE Of BROWN ROT 
Sul p hur dust has yee acl 4TH CONT AETER HOLDING #o SHIPPING 
TE 7 edie eee = SO FO tale eae ae as 
given approximately 
as good _ brown-rot Sie ONE 
control asthe standard 
Spray materials. A UN SPRAYED 
summary of spraying 
and dusting results is FIG. ee the ule a development of brown- 
: : rot on sprayed and unsprayed Italian Prunes in 11 dif- 
shown in Figure 8. ferent spraying and holding experiments. 
RECOMMENDATIONS FOR THE CONTROL OF BROWN-ROT OF 
PRUNES. 
The prune brown-rot problem in the lower Columbia and Willam- 
ette Valleys is apparently not so much a matter of finding remedies 
as a question of how much money and effort the grower is justified 
in spending and is willing to spend on a disease that 1 is more or less 
erratic in its occurrence. The experiments reported here seem to 
PECOINTACE leave no doubt that 
aBeww-RoT CRCYLUEP — PERCENTHOE O- BROWN LO” = 3 . 
AT HADEST TREATHENT AFT HOLDING WO HPF Sia ett ene raed mess 
ures that have become 
eee ye! Os OE OB 2 [0 (6 ZO Zs 
a “ i y well estab- 
ished in sections of 
itt ae. the eastern United 
SERED LAST States where brown- 
rot 1s more constant 
UNSPCYVED in its occurrence 
(G3) would fully meet the . 
Fic. 7.—Control of brown-rot on prunes as influenced by situation | in the hu- 
ae ee reer of aprey or dust ce to me ee be- mid sections of the 
ore picking time verage resu rom 7 orchard ex- a "ight M , 
periments and 11 holding tests. ls acific Northw est ig 
consistently applied. 
The question is really one of balancing the cost of insurance against 
the possibility of loss and determining the most economical pr ocedure. 
Giving more careful attention to cultivation can be safely recom- 
mended as a good investment. Plowing done in the fall, winter, or 
early spring and frequent harrowing before and during the blooming 
season will decrease the number of apothecia. 
Many of the orchards of this section need heavier pruning. A 
proper thinning and cutting kack of the top encourages a renew al of 
fruiting wood, gives a better set of fruit, and helps to prevent brown- 
rot by admitting the sunlight and by giving an opportunity for 
thorough spraying. 
