104 



830. CARBOLIZED LIME. 



Finely -pulverized fresh lime, 50 pounds. Crude carbolic acid, li 

 pints. Thoroughly mixed and dusted on plants as a repellant. 



831. CARBOLIZED PLASTER. 



Same as above, except that common land plaster (gypsum) is used in 

 place of the lime. 



832. CHARCOAL. 



Powdered charcoal is applied about the base of plants or dusted on 

 the foliage. 



833. CHLOROFORM. 



Used in closed cases against household pests and insects infesting 

 stored grains; also on domestic animals against certain pests. 



834. COAL TAR. 



Painted on tree trunks, etc., to catch or prevent insects from mount- 

 ing. By adding a few quarts to a barrel of water a solution is made to 

 sprinkle plants as a preventive. The smoke from burning coal tar is 

 used as a repellent. Emulsified with soapsuds it is applied as a spray, 

 using one-third coal tar to two-thirds soapsuds, and diluting with 5 to 10 

 parts of water. 



835. CORROSIVE SUBLIMATE.— Mercuric chloride. 

 Chiefly used in solution against household pests. 



836. CYANIDE OF POTASSIUM. 



Chiefly used in fumigating fruit trees infested with scale insects. 

 For directions see publications of Division of Entomology. 



837. DUST. 



Fine dust is effective against various slugs — larva* of saw-flies. 



838. GAS LIME. 



Is applied to the soil to prevent injury to plants by root-feeding in- 

 sects. 



839. GAS TAR. 



A strong solution is sprayed on plants or applied about the roots. 

 Of but little value. 



840. HELLEBORE. 



The powder is sifted on alone or mixed 1 part to 20 of flour. With 

 1 gallon of water one-fourth pound is mixed, as a liquid to be sprayed. 



