103 



820. ALCOHOL. 



A 30 per cent solution is sprayed on soft-bodied insects. Ofbul lit 



tie use. 



821. ALUM. 

 Used cither as a powder or in solution. 



822. ASHES. 

 Wood ashes sifted on or placed around the bases of plants. 



823. COAL ASHES. 



Dusted on plants or placed about their base as a repellant. 



824. BICROMATE OF POTASH. 



Is dusted on leaf-eating insects. 



825. BISULPHIDE OF CARBON. 



For use in the ground, a quantity is poured or injected among- roots 

 that are being injured. It is similarly used to destroy nests of ants. 

 Against insects injuring stored grain about li pounds are used for each 

 ton of grain in a closed bin. It must be used cautiously, as the fumes 

 mixed with air are very explosive. 



826. BORAX. 



The powder or a strong solution is applied in crevices or on surfaces 

 frequented by roaches, etc.. to drive them away. 



827. BORDEAUX MIXTURE. 



This important fungicide has some value as an insecticide. It is also 

 better than water as a medium in which to apply Paris green, the lime 

 preventing all injury to foliage. 



Copper sulphate ♦ pounds. 6 



Lime do. . . . 4 



Water gallons. . r> 



Dissolve the copper sulphate in 8 or 10 gallons of water, slack the 

 lime, add water enough to make a creamy whitewash: pour this slowly 

 through a coarse suck into the copper sulphate solution. Add water 

 to make 45 gallons. Add 1 ounces Paris green to each 50 gallons. 



828. BRAN. 



Often recommended for Cabbage Worm. Probably of little value. 



829. CAMPHOR. 



As a preventive this is confined in drawers and packages to pro- 

 tect dry goods and specimens. 



