114 INJURIOUS INSECTS OF 1903. 



Formula: 



Sour milk, i gallon ; 



Kerosene, 2 gallons. 

 Dilute as in the preceding. If the milk is sweet add a 

 little vinegar. 



33. Lead Arsenate — (See Arsenate of Lead.) 



34. Lime — 



Lime is of little if any value as an insecticide, being 

 simply a deterrent and irritant. It can be used wet or dry 

 on foliage without harm. When dusted on pear or other 

 tree-slugs it prevents them from doing much damage. 



It is used to prevent Sun Scald by making a coating on 

 the body of the tree in early spring. To increase the ad- 

 hesive power make according to the following formula : 



Skim milk, 6 gallons ; 



Water, 30 gallons ; 



Lime, 60 pounds ; 



Salt, 10 pounds. (Can. Exp. Farm Rpt., 1900.) 



35. Lime-Sulphur-Salt — 



Recent experiments show that this is probably the 

 best scale insecticide yet discovered. It must be used 

 only on dormant trees. When applied at this time it has 

 also been found to exterminate Woolly Aphis, Pear Leaf 

 Blister Mite, "Red Spider" eggs, etc. 



Formula : 



Quick lime, 50 pounds ; 

 Sulphur, 50 pounds ; 

 Salt, 50 pounds ; 

 Water, 150 gallons. 

 Slake the lime thoroughly, then add the sulphur; cover 

 with water and boil briskly for at least one hour. Then 

 add the salt and boil 15 to 20 minutes longer. Add water 

 to make 150 gallons. 



During the past summer Dr. E. P. Felt, N. Y. State 

 Entomologist, experimented on the method of making 



