SOLUTIONS FOR SPRAYING 143 



15 to 30 cents a pound. In hundred-pound kegs it can 

 be boug"ht for about 18 cents a pound. It is simply 

 mixed with water, using 2 to 5 pounds to the bar- 

 rel. For fighting the codling moth 3 pounds to 50 

 gallons of water is recommended. At this rate it is 

 considerably more expensive than paris green ; but the 

 fact that there is le^s danger of burning the foliage, 

 and the more important fact that the ar senate of lead 

 will stick through all ordinary rain storms, probably 

 justify this increased expense. 



In using arsenate of lead it is best to make it up 

 into a paste with a small amount of water. Then 

 simply put the required amount into the spray tank 

 and pump in the water. 



ARSENITE OF LIME 



A somewhat similar insecticide occasionally used is 

 arsenite of lime. It is made as follows : 



1 pound white arsenic 



2 pounds fresh lime 

 i gallon of water 



Boil together in an iron kettle for 45 minutes to an 

 hour and keep in tight bottles or fruit jars. When 

 ready to use add i quart of this stock solution to 50 

 gallons of water. Some lime water should usually be 

 added also. 



This is the cheapest form of arsenical spray yet 

 devised, costing in reality only from one-tenth to one- 

 third what other arsenical sprays cost. As it is ef- 

 fective, it is worth considering, though most orchard- 

 ists seem to prefer ready-made arsenate of lead on 

 account of its easier manipulation and its sticking 

 qualities. This arsenite of lime is best when used 

 with bordeaux mixture. 



