290 INSECTS INJURIOUS TO STAPLE CROPS. 



Sulphur. 

 Apply at rate of 1 ounce to a gallon of water for red 

 spiders and mites. Often used to rid poultry -houses of 

 vermin. May be mixed with lard and nibbed on skin 

 for lice that infest animals. Sprinkle in greenhouses, 

 especially over steam or hot-water pipes. 



GASES. 



Carbon Bisulfide. 

 Used against insects affecting stored goods and grain. 

 Is a clear volatile liquid, giving off fumes heavier than air. 

 Sold in 25- to 100 pound lots at 10 to 12 cents per pound. 

 May be thrown directl}^ on wheat without injury to it, or 

 may be placed in shallow dishes. For wheat in store apply 

 1 to 3 pounds to every 100 bushels. Make the enclosure as 

 tight as possible, cover grain with blankets if necessary. 

 Leave for twenty -four hours; over thirty-six hours will 

 injure germinating qualities of grain. Do not inhale the 

 fumes, or allow any light, cigar, or pipe around building, 

 as gas IS exceedingly explosive. For open enclosure use 

 1 pound to every 1000 cubic feet of space. 



Hydrocyanic Acid Gas. 



The best agent for the disinfection or fumigation of 

 nursery-trees and plants, certain greenhouse insects, and 

 pests of dwelling-houses, store-houses, mills, etc. Made 

 by combining cyanide of potassium, sulphuric acid, and 

 water. Diffuses quickly, is lighter than air, and a most 

 deadly poison.* 



* See "Fumigation Methods" by W. G. Johnson, Orange .Tudd 

 Co 



