The Bulletin. 53 



putting in bin with the corn have all been mentioned, and must be 

 classed among the remedies or preventives that have not been adequately 

 proven. In his former Bulletin the Avriter stated that "shelled corn may 

 be placed in absolutely tight bins and top of each bin covered with a 

 complete layer of lime or ashes to depth of an inch. Of course, this is 

 only practicable for those bins that are not being continually disturbed." 

 This suggestion is not based on actual tests, but only as a chance to keep 

 the Weevils out, and Avould be in no sense a remedy for those already in 

 the corn. 



Fumigation Treatment. — But for the Weevils that are already in the 

 corn, or the ones that may gain entrance after it has been stored, we 

 know of no treatment other than fumigation with some poisonous gas 

 that can be relied upon, and some recent testimony shows this to be 

 less certain than was formerly believed ! 



For this purpose the material known as carbon bisulphide (or car- 

 bon disulphide) has long been, and still is, the standard material. It 

 is a clear, foul-smelling liquid which evaporates rapidly, giving off 

 poisonous fumes. It is necessary to have the grain in some tight re- 

 ceptacle, absolutely tight if possible, or at least as near to it as possible. 

 For small quantities, as for seed grain, etc., a water-tight barrel or cask 

 can be used, or boxes if cracks and covers be sealed by pasting paper 

 closely over them. The tighter the better, and the less the barrel, box, or 

 bin approaches to perfect tightness the less perfect you must expect 

 the result to be, and the greater amount of the material you must use in 

 the effort to make amends for leaking of the gas. 



A brand of the chemical especially made for insect work is manu- 

 factured by E. R. Taylor, Penn Yan, IST. Y., under the name of "Fuma 

 Carbon Disulphide," and is sold in lots of 50 lbs. or more. In small 

 quantities the chemical can be had from, or ordered through, many 

 drug stores, at retail prices of about 30 cents per pound (pint). 



The amount to use is figured on the air space in the barrel, box, 

 bin, or room (not merely on the amount of grain). Professor Hinds 

 in Alabama says this should be at the rate of 5 to 8 lbs. for 1,000 cubic 

 feet of space if the room or bin is quite tight, varying up to as high as 

 20 or 25 lbs. per 1,000 cubic feet of space if only moderately tight as 

 by lathing the cracks, and says that for use in barrels ("for peas") 

 "about one-half teacupful is sufficient if the top be tightly covered." 

 The "Black Weevil" in corn may require more than this amount, per- 

 haps three-fourths of cupful. 



Professor Hinds says : "In making the application, level the surface 

 and prepare small holes about a foot deep, about 3 to 4 ft. apart. 

 Divide the liquid among these holes; pour direct on the corn in the 

 holes and fill the holes with corn." If the room is large, begin on the 

 farther end, working toward the door. "Close door tightly and quickly 

 paste paper over the cracks ; leave closed for at least 24 hours ; no harm 



