166 INSECTS TXjrRiors to staple crops. 



harvested, it may be threshed at once; if not, as soon as it 

 is in good condition. If the sacked grain is infested, there 

 will not be wormy kernelc sufficient to heat the grain. 

 The moths cannot make their way out and are stifled. 

 Nothing can come in from outside and the grain remains 

 safe. The threshing itself kills many of the insects and 

 jars and rubs off many of the eggs. If binned, the bins 

 should be tight and the grain should be tested occasionally 

 for any ajDpreciable heating. If it heats perceptibly, it 

 indicates considerable infestation, and it should be treated 

 with carbon bisulfide at once, used at the rate of one drachm 

 per cubic foot, or one pound for 250 cubic feet bin-space." 

 We have sometimes found two or three pounds for 100 

 bushels of grain necessary, though one or one and one-half 

 pounds for 100 bushels has been often recommended. The 

 bisulfide should be placed in shallow plates or pans on top of 

 the grain, preferably not over a pound in a vessel, and the 

 bin should then be covered with boards, canvas, or olankets, 

 and allowed to remain at least twenty-four hours. If to 

 be used for seed, it should not be left for over thirty-six 

 hours; but if not, leave it forty-eight hours, which will do 

 it no injury for food. After treating kee}) the grain 

 covered to prevent reinfestation. 



Those having wheat unthreshed, whether in stack or 

 mow, should thresh at once, and treat as above directed, 

 except that if much of it is noticed to be wormy, it should 

 be treated with carbon bisulfide at once, as soon as 

 threshed, which if done thoroughly will prevent any 

 further infestation this year. 



Barns and storehouses should be cleaned up and freed 

 from all loose and scattered grain — chickens will help in 

 this — before April 1st, so that no moths will be allowed to 



