596 



EXPERUIEy'TAL FARMS 



5 GEORGE v.. A. 1915 



injury- The Swift's arsenate of lead averaged 2-60 per cent injury and the Sherwin- 

 Williams plots averaged 2-47 per cent injury. 



The data relative to leaf injury was obtained by taking 100 leaves from branches 

 and twigs on a part of the tree showing least injury and 100 leaves from a part 

 showing worst injury. These were taken consecutively as they grew. The leaves were 

 gone over carefully and the per cent of injury determined. This work was checked 

 up against field observations, which placed the injury in the same relative position. 



The work was conducted on a block of Spy apples in the Berwick orchard. The 

 results are as follows : — 



Materials Used. 



p.c. Scab p.c. Foli- 

 Total age Injury 



Lime-sulphur 1-40, Swift's arsenate — 2 lb. to 40 gn.' — 



" 1-40, Sherwin-Williams 2 " 40 " . . 



" 1-40, Swift's arsenate 3 " 40 ' . 



1-40, Sherwin-Williams 3 " 40 " . . . 



" 1-30 Swift's arsenate 2 " 40 " . . . 



1-30 Sherwin-Williams 2 " 40 " . . . 



Check, no spray 



Sherwin-Williams arsenate alone, 2 lb. to 40 gal 



Lime-sulphur 1-40, J. C. Eng. arsenate, 2 lb. to 40 gal 

 1-30, " " 2 " 40 " 



1-40, S. C. " " 2 " 40 " 



1-30, " "2 " 40 " 



FUNGICIDAL VALUE OF ARSEKATE OF LEAD. 



It is claimed that to add arsenate of lead to lime-sulphur the lime-sulphur will 

 thereby be made more effective as a fungicide. A series of tests were started at 

 Berwick and Falmouth to get information on this point but unfortunately the check 

 plots and also the comparative plots in many cases did not produce fruit. On one 

 block of Spy apples at Berwick the following results were obtained: — 



Lime-S. 1-40, 3 lb. arsenate lead. 



1-40 2 



1-30, 2 " " . 



Check, no spray 



Arsenate of lead alone 



p.c. No. 

 3 



32-71 

 36-68 

 30-58 

 91-43 

 95-28 



p.c. Cull 



1-72 

 0-45 

 1-64 

 5-71 

 2-86 



The total scab on the lime-sulphur arsenate plots was for the'most part only slight, 

 whereas that on the unsprayed and arsenate of lead plots was largely m'edium or 

 badly scabbed. The arsenate of lead when used alone at least apparently has little 

 value as a fungicide. Results in the Falmouth orchard would go to show that lime- 

 sulphur arsenate is preferable to lime-sulphur alone.' The lime-sulphur arsenate had 

 19-07 per cent of scab and the lime-sulphur alone 29-25 per cent of scab. 



HOME-BOILED VS. COMMERCIAL LIME-SULPHUh. 



In order to determine the relative efficiency of home-boiled as compared with 

 commercial lime-sulphur, a series of plots was sprayed with the two. The home- 



Kentville. 



