INSECTS OF ECONOMIC IMPORTANCE 



Kedzie formuk 



Common formula ^"^ - 



1 lb. white arsenic 



2 lbs. quick lime 

 Taft formula '* -! 2 gals, water 



Boil together for 40 min. and dilute 

 to 300 gallons with water. 



I lb. white arsenic 



4 lbs. crystals sal soda 



I gal. water 



Boil together until dissolved — about 

 15 or 20 min. Use i pint to 50 

 gals, water with 2 or 3 lbs. quick 

 lime added. 



I lb. white arsenic 



I lb. sal soda 



1 gal. water 



2 lb. quick lime 



Dissolve the white arsenic and sal soda in the 

 water by boiling all together in an iron vessel for 

 about 15 or 20 minutes. Use this solution while 

 hot to slake the lime. Add enough water to make 

 2 gallons. Use 2 quarts of this to 50 gallons of 

 water. 



Another method of making arsenite of lime is to 

 boil I pound of white arsenic and 4 pounds of quick 

 lime in 4 gallons of water for half an hour and 

 then dilute to 200 gallons of water. The arsenic 

 may not all combine with the lime thus causing 

 burning. These combinations of arsenic and lime 

 have not given satisfaction when used with lime- 

 sulphur.^"^ 



Paris green 



First used against Colorado potato beetle about 

 1868; 2000 to 3000 tons used every year; it is com- 



!•* Woodworth and Colby — Calif. Expt. Stat., Bull. 126, p. 22,. 



15 Qnaintancc — U. S. Dept. Agri., Yearbook igo8, p. 275. 



16 Slingerland, Herrick, Crosby — Cornell Univ. Expt. Stat. 

 283, p. 476. 



17 Scott— U. S. Bu. Pit. Ind., Circ. 54, p. 14. 



Bull. 



