DIVISIOX OF EORTICULTURE 



755 



SESSIONAL PAPER No. 16 



DRY AKD PASTE ARSENATE OF LEAD WITH LIME AND SOLUBLE SULPHUR. 



Tlie sprays as given in tlie following table were all applied under similar conditions 

 in each place and in a uniform manner. Three trees were included in each plot. The 

 trees were as uniform as could be obtained. As the trees were of even size practically 

 the same amount of liquid was used to each plot averaging 15 gallons to 3 trees. The 

 mixture was kept thoroughly agitated and the work carefully done in order to avoid 

 any possible error due to method of application. 



All the sprays in the tests on the Baldwin trees were put on May 18, June 3, June 

 15, and July 2. The foliage injury given below on these trees was confined entirely to 

 the fourth spray. It will be noticed, also, that the control of scab was apparently as 

 good in the plot without arsenate as where arsenate of lead was used in the spray. 



The varieties of King and Baldwin were used at Bridgetown in this test and the 

 results would seem to show that arsenate of lead when added to the lime-sulphur adds 

 very little to its fungicidal value. We cannot explain why control of scab should be 

 so great on the plot of Baldwin trees where arsenate of lead only was used. 



It will be seen that the foliage injury is much greater on the soluble sulphur plots 

 than on the lime-sulphur plots with the same amount of arsenate of lead. It would 

 appear that the increase of arsenate of lead in the soluble sulphur did not materially 

 increase the total foliage injury at Bridgetown, but at Berwick where the arsenate 

 was left out of the first spray there was no injury. It will be noticed also that there 

 was no apparent injury from the second spray May 31, at Berwick and that the foliage 

 injury was confined principally to the two sprays after blossoming. The plots on which 

 no arsenate of lead was used in the first spray did not show as good scab control as the 

 duplicate plots where it was used and the plots sprayed with soluble sulphur only would 

 show that arsenate of lead very materially increases the fungicidal value of soluble 

 sulphur. 



It should be noted that the insect injury recorded is that apparent from an 

 examination of the fruit at picking time and does not include any foliage or other 

 injury up to that time. This orchard has in the past always been well sprayed and the 

 insect pests have, as a result, been kept well under control, which no doubt accounts for 

 the small per cent of insect injury. 



TOMPKINS KING APPLE, BERWICK. 



Soluble Sulphur used in four Sprays. 



B-S. U pounds to 100 gallons Dry arsenate 2 pounds to 100 gallons 

 '< 11 " " lOQ " " " 4 " " 100 " 



" i| " " 100 " Swifts arsenate paste 5 pounds to 100 



gallons 



" 1^ " " 100 " Swifts arsenate paste 7 pounds to 100 



gallons 



No Spray 



L-S 1-008, Swifts arsenate paste5 pounds to 100 gallons 



Per cent. 

 Foliage 

 Injury. 



35- 



Co- 

 bs- 



0- 



Per cent. 

 Scab. 



10 



17 • 



18-0 



31 

 82 



7 



Per cent. 

 Insect 

 Injury. 



1-3 

 00 



00 



2-3 

 7- 

 •3 



Kentville, 



