743 E2 1 ERIMENTAL FARMS 



7 GEORGE V, A. 1917 



several tests conducted to determine the value of barium chloride would go to show 

 that there is on the whole some slight advantage from its use, but that the advantage 

 is more than offset by the added cost. It does not, by any means make soluble sul- 

 pliur arsenate a safe spray. Barium chloride costs 50 cents per pound, and as chloride 

 of lime gives better results and costs only 15 cents per pound it seems unnecessary 

 to experiment further with this substance. 



The injui'y caused by the soluble sulphur arsenate spray is evidently due to the 

 combination formed when arsenate of lead is added to the soluble sulphur solution. 

 This is shown in our tests conducted at Berwick and given further on under the head- 

 ing " Dry and Paste Arsenate of Lead with Lime and Soluble Sulphur." 



We are now advised that arsenate of lime when used with soluble sulphur in 

 place of arsenate of lead gives a 'spray that causes little if any injury. We have not 

 tried arsenate of lime, but judging from our results with chloride of lime, which no 

 doubt produces a somewhat similar combination when added to the soluble sulphur 

 arsenate of lead spray, it may prove to be a satisfactory poison. 



Five pounds of arsenate of lead was used in these spi'ays and the quantity of 

 soluble sulphur varied from 1^ pounds to 100 gallons to 2i pounds to 100 gallons. 

 The results at Bridgetown would show quite an advantage from the use of barium 

 although it does not by any means eliminate the burning. Wliere the half-pound 

 was used to the li pounds of soluble sulphur, quite a gain is shown at Berwick, but 

 that this quantity of barium chloride is of no value- where the 2 or 2-^ pounds of 

 soluble sulphur is used to 100 gallons is shown by the Berwick and Falmouth experi- 

 ments. The Falmouth tests show 25 per cent gain however from the Barium chloride 

 added to the spray of 1^ pounds soluble sulphur to 100 gallons, over the plots on- 

 which barium chloride was not used, but there was considerable burning about equal 

 to that of Berwick on the plots where the barium chloride was added. 



Kentvilli:. 



