36 MAIXE AGRICULTURAL EXPERIMENT STATION. 



alone in 50 gallons of water. On another plot lime-sulphur, 

 20 per cent stronger than standard dilution, was used in place 

 of bordeaux mixture at the first application. These and all 

 other plots in the same experiments were all sprayed on the 

 same days, first on May 23 when the flower buds were showing 

 pink, second June 6, just after the petals fell, and again on June 

 22. Those mentioned above were compared with adjoining 

 plots sprayed with bordeaux mixture, standard strength lime- 

 sulphur and lime-sulphur 20 per cent stronger than standard, 

 to which, in each case, one pound of dry arsenate of lead had 

 been added to every 50 gallons of spray. An unsprayed check 

 plot was also saved. 



The season of 1914 was somewhat peculiar with reference 

 to scab development and control. The disease was not par- 

 ticularly severe at Highmoor Farm, even on unsprayed trees, 

 and the results secured from treatment with standard sprays 

 were rather erratic. However, nothing occurred to materially 

 change the tentative conclusions derived from the work of the 

 two previous years regarding the fungicidal value of arsenate 

 of lead, although its relative efficiency in 1914 was consider- 

 ably less than before. When lime-sulphur 20 per cent stronger 

 than standard dilution plus one pound of dry arsenate of lead 

 was used for the first spraying and two pounds of the arsenical 

 was used alone for the later applications, 96 per cent of perfect 

 apples were obtained as compared with less than 94 per cent 

 where standard dilution of lime-sulphur was used in combina- 

 tion with the smaller amount of the insecticide for all three 

 applications. Scab control was slightly better on the last men- 

 tioned plot, but there was decidedly more russeting of the fruit, 

 thus decreasing the percentage of perfect apples. 



A rather surprising result was obtained where bordeaux mix- 

 ture was used for the first spray, even though it was applied 

 before the blossoms opened. Over 15 per cent of the fruit was 

 russeted as compared with less than two-tenths of one per cent 

 on the unsprayed check plot. This could not be attributed to 

 the later applications of arsenate of lead for, on this plot where 

 all three applications consisted of the stronger amount of this 

 material alone, only a little over one per cent of the fruit was 

 russeted. 



