120 FRUIT-GROWING 



bit by making only one stock solution — that of 

 copper sulphate. In this solution each gallon 

 represents one pound of the chemical. The 

 spray tank is filled nearly full of water and the 

 engine started in order to agitate the contents 

 of the tank. Then the correct amount of hy- 

 drated lime is poured into the tank — with the 

 engine at work. This makes a very dilute lime 

 solution to which the proper number of gallons 

 of copper solution are added. 



There is only one internal insecticide that 

 the orchardist need keep in mind and that is ar- 

 senate of lead. At present this is furnished by 

 the makers in the form of a white powder 

 which is used at the rate of a pound and a half 

 to each fifty gallons of water. 



The winter spray in the orchard should be 

 applied as late in the dormant season as possi- 

 ble, but before the buds have opened enough to 

 show any green leaves. It should consist of 

 commercial lime sulphur diluted at the rate of 

 one to five (or four) if blotch is present. Such 

 a spray will kill all scale insects, kill the eggs 

 of plant lice and will prevent the development 

 of blotch cankers. 



The first summer spray should consist of 

 lime sulphur diluted at the rate of one to forty 

 and in addition should carry one and one-half 

 pounds of arsenate of lead to each fifty gallons 

 of solution. This must be applied just before 



