THE MONTHLY BULLETIN. 



169 



Control. — All host plants should be kept from growing in or around 

 the potato fields. Deep planting and hilling should be practiced to pre- 

 vent access to the tubers. The potatoes should be dug as early as pos- 

 sible and not allowed to remain in the fields over night, unless sacked. 

 In places of general infestations the tubers may be thoroughly disin- 



FiG. 153. — Cross-sections of potato, showing the interior worlc 

 of the potato tuber moth. (Essig, M. B. Cal. Hort. Com.) 



fected before storing, by soaking them in water for thirty-six hours. 

 In the storage bins, two pounds of carbon bisulfid to every one thousand 

 cubic feet of air space will prevent injury, provided this is done four 

 or five times, or as often as adult moths appear. 



