126 The Fruit-Growers Guide-Book 



tree trunks to keep insects from crawling up from the 

 soil. This is especially the case with woolly aphis. These 

 insects when born are inclined to travel, and since the first 

 brood in spring come from the old ones which have hiber- 

 nated on the roots, they climb the trees and live on the 

 branches during the summer. They can be prevented by 

 tying a ring of paper, underlaid with cotton, around the 

 trunk and applying the tanglefoot to the paper. If applied 

 directly to the bark it may cause injury. 



Paris Green 



This insecticide has been used for a greater number 

 of years than any other now in use, and when perfectly 

 pure it is very reliable, but as it is a rather coarse crysta- 

 line material, it settles rapidly to the bottom of the spray 

 tank unless the contents are kept t-horqughly stirred. It 

 is applied in connection with quick lime, the lime being 

 added to prevent the Paris green from burning the foliage. 



It is prepared for use as follows: 



Paris green, 1 pound. 

 Quick lime, 4 to 5 pounds. 

 Water, 160-200 gallons. 



Mix the Paris green with a little water and stir it to a 

 thin paste; meanwhile slake the lime to a thin paste and 

 then add the paste of Paris green and mix the two thor- 

 oughly, after which strain the mixture through a fine seive 

 into the spray tank containing the requisite amount of 

 water. If it is desired to use the poison in connection with 

 a fungicide, bordeaux mixture can take the place of the 

 water in diluting the above mixture. In applying this mix- 

 ture to the trees or plants it is necessary to keep it well 

 stirred all of the time, as the Paris green will settle to the 

 bottom of the vessel, thereby giving irregular distribution. 



Arsenate of Lead 



Arsenate of lead is now the leading insecticide, having 

 taken the place of Paris green for all orchard purposes. 



