210 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 7 



weevils on these ears and secure their removal from the field at such 

 a time as we may have the maximum number of the old weevils thereon 

 and before the first new fall generation will be ready to emerge and 

 spread into the main crop. This main crop may also be harvested as 

 soon as thoroughly matured. 



Harvesting Methods: — Have the storage crib thoroughly cleaned 

 and ready. For the main crop we would advise breaking the ears 

 from the husk as it is gathered, thus leaving three fourths, at least, of 

 the weevils in the field. Have the wagon-body fitted with a cross 

 partition, so that the slightly infested corn may be kept separate from 

 that already quite heavily infested. Of, if preferred, provide for the 

 separation to be made as the corn is unloaded. Have boxes on each 

 side of the wagon-body, or at its end, to receive the best ears from 

 which the seed for next planting may be finally selected. At the crib 

 in which corn will be carried longest in storage, leave only the 

 soundest corn. Never mix good and bad ears in the long storage bin if 

 possible to avoid it. 



The many weevils that are shaken off into the bottom of the wagon 

 should be swept out at some distance from the crib so that they will 

 not be likely to find their way back to it. In these ways the storage 

 period may be started with a minimum number of insects present. 



Fumigation Treatment: — Where weevils are present in abundance 

 at storage time and the corn cannot be fed out for several weeks, 

 there is no better way to check insect injury therein than to fumigate 

 with carbon disulphide. This should be done on a warm day and at 

 least 20 pounds per 1000 cubic feet should be used. Small dosages 

 are usually so much thrown away. A spring treatment in March is 

 likely to be required and if the work is well done, there is little likeli- 

 hood of another being needed. At this time of year fumigation is likely 

 to have least effect upon the Plodias because the larvse of that species 

 wander away from the corn and seek pupation shelter in places where 

 the treatment is not likely to reach them. 



It will take many years to effect a general change in the methods of 

 handling and storing corn in the South, but it certainly seems possible, 

 through continued work along these lines, to save to this section a 

 large part of an insect injury that now taxes us to the extent of many 

 millions of dollars annually. 



Mr. Henry Skinner : I would like to ask in what kind of receptacle 

 the fumigation is done. 



Mr. W. E. Hinds: Usually the entire mass of corn in the house is 

 treated. 



