INJURIOUS INSECTS OF 1903. 99 



can be diluted to the required strength when ready for use. 

 The prepared mixture loses strength on standing. — (Mass. 

 Bui. 80, 1902.) 



2. Arsenate of Lead — 



This is the least soluble of all the arsenical insecticides, 

 and is, therefore, not liable to burn the foliage, even if used 

 in large proportions. It is also quite adhesive. 



FORMUIvA — 



Dissolve II ounces acetate of lead (sugar of lead) 

 in 4 quarts of water in a wooden pail, and 4 ounces 

 arsenate of soda (50 per cent purity) in 2 quarts of 

 water in another wooden pail. (The sugar of lead 

 can be dissolved more quickly by using warm water.) 



If only a small quantity of the arsenate of lead is re- 

 quired it can be purchased in the prepared paste form. 



The above solutions poured into 150 gallons of water 

 is required for Codling Moth, Tent Caterpillars, etc. ; 

 while these solutions poured into only 25 gallons of water 

 is required for the Elm Leaf Beetle. — (Mass. Bui. 80, 

 1902.) 



Arsenate of lead may be used whenever Paris Green is 

 recommended. 



3. Arsenic Bran Mash — 



Formula : 



White arsenic, i pound ; 

 Brown sugar, i to 2 pounds ; 

 Bran, 6 to 10 pounds. 



Mix thoroughly and then add water to make a wet, but 

 not sloppy, mash. 



It is used against Cutworms working in garden crops, 

 at the rate of one teaspoonful at the base of each plant. 

 (Cal. Bui. 142, 1902.) With tender plants like melons 

 care should be ■ taken lest heavy rains wash the poison 

 against the stems and thus burn the plants. 



