SPRAYING PEACHES. a7 
Taste VII.—Results of treatment for peach scab on the Elberta variety, Okonoko, W. Va., 
1910. 
Fruit : ie Mer- 
Total | affected | .-.74.2 chant- 1 
IBUEES friilts:, | with’ | Muected | apie.) Cus. 
scab. teal). fruit. 
| ira 
Number. | Per cent.| Per cent.| Per cent. | Per cent. 
Ll, arene hOB OC EB OS IC OCROOOROOCHE DOS ren ope operas 1,322 65. 2 3.0 86.1 13.9 
Rete hel stra oe iaiarcla ema "Sae etn Sia ais stare Oe aysrelnecresatemiaie ese c 1, 566 | 20. § 0.1 95.5 4.5 
a) 5 bo COL DAR GS DEE COED SO OS CO Boo SACO eeEE AOC eee ee res 2,277 20.2 1.4 93.1 6.9 
es oe Sat ES Ce Ce Serge ae ae as ar 1,819 | 55.8 0.9 93. 6 6.4 
Geemarc aera eS Sere eis. we be ctethe otal cloc ee aicmr scene a\eiere eve 1,924 49.3 U5 93.9 6.1 
(CG eG ee ee ne ee ee eee 2,918 99.6 41.1 Dont 46.3 
The third column of the above table shows the percentage of 
fruit affected with scab, including fruit so slightly affected that its 
market value was not materially reduced, while the fourth column 
shows the percentage of badly affected, unmerchantable fruit. The 
fifth column shows the percentage of good, merchantable fruit 
obtained from each plat, while the sixth column shows the percentage 
of culls due to scab, brown-rot, curculio, and other causes. 
Plat 1 received only one application, and the results were all that 
could be expected in a wet season, such as last spring. Although 65.2 
per cent of the fruit was affected with scab, only 3 per cent of it was 
badly affected. 
Plats 2 and 3, which were sprayed twice, gave the best results, 
only a little more than 20 per cent of the fruit in each being 
affected with scab. Most of this scab infection was commercially 
negligible, the spots being small and rather inconspicuous. In plat 
2 less than 1 per cent of the fruit was badly affected, and in plat 3 
only 1.4 per cent was so affected. The only difference in the treat- 
ment received by these two plats was the use of arsenate of lead with 
the self-boiled lime-sulphur in the first application on plat 2. This 
made no difference in the control of scab. It apparently raised the 
percentage of merchantable fruit, plat 2 having 95.5 per cent and 
plat 3 having 93.1 per cent. This difference would certainly have 
been greater had there been more curculio in the orchard. 
The good results obtained from the treatment of these two plats 
may be better appreciated by comparing them with the results from 
the unsprayed trees. Practically all (99.6 per cent) of the unsprayed 
fruit was affected with scab and 41.1 per cent of it was badly affected. 
Only 53.7 per cent of the fruit was suitable for market, leaving 46.3 
per cent of culls. 
Plat 5 received the same treatment as plat 3, except that both 
applications were delayed two weeks. The results indicate that one 
month after the petals fall is a better time to begin spraying for 
scab than two weeks later. ) 
430 
