PLANTING AND CARE OF TREES 177 



r Copper sulphate 8 pounds 



^ \ Water 50 gallons 



r Fresh stone lime 8 pounds 



^ ^ Water 50 gallons 



The copper sulphate may be dissolved either by the use of hot 

 water or by suspending it in a burlap sack at the top of a barrel, 

 of cold water. The lime should be slowly slaked, using a little 

 water at a time. When both solutions, a and h, are ready, they 

 should be poured simultaneously into the spray tank. When 

 large quantities are required it is customary to make up stock 

 solutions of copper s-ulphate and of lime, using two pounds of 

 each to a gallon of water. To make a hundred gallons of Bordeaux 

 mixture from these stock solutions it will be necessary simply to 

 measure out four gallons of each, dilute each with 46 gallons of 

 water (50 — 4=46), and strain into the spray tank. 



AVhen a tree needs to be sprayed for some leaf-eating insect 

 as well as for some disease, six to ten pounds of arsenate of lead 

 may be added to every hundred gallons of Bordeaux mixture. 

 There are many brands of prepared Bordeaux mixture on the 

 market and some of them contain arsenic, either in the form of 

 arsenate of lead or Paris green. Pyrox and Bordeaux-lead are 

 common examples of such preparations. They are convenient 

 remedies and are very efficient, but cost more than the home-made 

 mixture. 



The commercial lime-sulphur wash Avhich has been discussed 

 under the heading of Insecticides, is also a good fungicide. When 

 used on Peach trees in the dormant condition, it may be depended 

 upon to kill scale insects and at the same time to control the 

 disease known as leaf-curl. It is also being recommended as a 

 substitute for Bordeaux mixture for spraying during the summer. 

 For spraying foliage, however, it should be diluted at the rate of 

 two gallons of the wash to one hundred gallons of water. 



SPRAYING 



Most people fail to spray for the reason that they believe it to 

 be a difficult and exacting operation. Those who have had experi- 

 ence have gained confidence and now regard the operation as a 

 necessary item in their yearly routine. There are many ]-)rofossional 



