BKOWN-ROT OF PRUNES AND CHERRIES. 7 



Table II. — Spraying for brown-rot of prunes at Felida, Wash., during the season of 



1915. 





Sprayings.i 



Yield 

 (number 



of 

 prunes). 



Brown-rot (per 

 cent). 



Plat. 



1st. 



2d. 



3d. 



4th. 



5th. 



6th. 



7th. 



At har- 

 vest. 



After 12 



days' 

 storage. 



First orchard: 



No.l 



PI 

 Fl 

 Fl 

 Fl 

 Fl 



P3 

 P3 

 P3 

 F3 

 PS 



"Vz 



F4 

 F4 





F4 



F4 

 P4 



r4 



F4 

 F4 

 F4 



723 

 1,410 



1,636 

 1,761 

 3,582 

 1,150 

 1,985 

 2.911 

 1,608 

 720 

 493 

 2,582 

 2 684 

 2 519 

 1,804 

 2,392 



4,391 

 5,633 

 5,295 

 4,673 



.48 

 1.08 

 .19 

 3.39 

 .13 

 .28 

 .12 

 .28 

 2.43 

 .27 





No.2 



2 



1^0.3 



6 



TVo. 4 





F4 

 F4 





15 



No.5 





F4 



1 



No. 6 



41 



No. 7 





F3 

 F3 



"yz 



F4 

 F3 

 F3 

 F4 





F4 



P3 

 P3 

 F4 

 F4 

 P5 

 F2 

 Fl 

 P6 

 F7 



F2 

 F8 

 F4 



F4 

 F3 

 P3 

 F4 

 F4 

 P5 

 F2 

 FI- 

 FO 

 F7 



F2 

 FS 

 F4 



3 



No. 8 





8 



No.9 



Fl 



3 



No. 10 





No. 11 











No. 12 



Fl 

 Fl 

 PI 

 Fl 

 Fl 



Fl 

 Fl 

 Fl 

 Fl 



" ■ F6" 



F5 

 Fl 

 Fl 



■ ■ F7' 



F5 

 F2 

 Fl 

 F6 

 F7 



P2 

 P8 

 F4 



2 



No. 13 





No. 14 



1.15 



.28 

 1.05 



4.16 

 4.67 

 3.29 

 5.35 





No. 15 



No. 16 



12 

 9 



Second orchard: 



No. 17 



51 



No. 18 









25 



No. 19 









37 



No. 20 







Fl 



95 

















1 The symbols, Fl, F2, etc., refer to the spray formula used, as explained on p. 6. 



2 Fruit shriveled from an unlcuovvn cause. 



The favorable effect of the early appUcations on the yield has 

 already been discussed. The amount of brown-rot at harvest time 

 was not large on any of the plats, but in the first orchard there 

 was more than nine times as much on plat 6, which was unsprayed, 

 as the average amount on the nine plats which received both early 

 and late applications of self-boiled hme-sulphur, the former havmg 

 3.39 per cent of brown-rot, the latter 0.36 per cent. In the second 

 orchard, plat 20, which received no late spray, had nearly twice as 

 much brown-rot as plat 19, which received late applications with 

 the above fungicide. The contrasts on the stored fruit were still 

 more striking, because of the larger amounts of the disease. The 

 prunes from the unsprayed plat of the first orchard had developed 

 41 per cent of brown-rot, while the average from the sprayed trees 

 mentioned above was 5 per cent. In the case of the second orchard, 

 the unsprayed fruit had 95 per cent of brown-rot, while that which 

 received a late spraying with self -boiled Ume-sulphur had 37 per 

 cent and that sprayed with commercial lime-sulphur 25 per cent. 



In some of the neighboring orchards where no sprayings were 

 made, more than three-fourths of the crop was affected with brown- 

 rot at harvest time (PL II). In such cases the fruit that was har- 

 vested was handled with great difficulty, as it would scarcely be in 

 a usable condition if allowed to stand over night at the drier. 



