THE MONTHLY BULLETIN. 



537 



tunneled ; these burrows become filled behind the larvas with excrement. 

 When about to assume the pupa state, the insect forms an oval cavity at 

 the end of its burrow, where it undergoes its transformation." 



We have no suggestions to offer as to any methods of controlling its 

 ravages in the fields or store room, in fact, we are not concerned with 

 remedies; our special function in the general scheme of horticultural 

 economics, is to prevent the necessity of having to offer remedies. The 

 methods we employ at quarantine for such purposes can not be con- 



FiG. 330. — Sweet potato taken at quarantine, showing 

 destructive work of adult sweet potato weevils on stored 

 potatoes. (Original. Photo by Archie Chatterley.) 



sidered as embodying any desirable economic features, consisting as they 

 do of the complete destruction of both the contents and container of 

 material found infested. However, this shortcoming on our part in the 

 matter of remedial measures for this particular pest (and for other im- 

 ported pests in general), need not cause any uneasiness among sweet 

 potato growers in California. This insect is not recorded as being in 

 the State at the present time, and if there is any virtue in diligent, vig- 

 orous concerted effort in the inspection of horticultural imports, it is 

 not going to get there for some time to come. 



