CARBON DISULPHID AS AN INSECTICIDE. 11 



In large masses of corn containing more than 1,000 bushels, where 

 the corn still has the husk on/ it is possible to kill enough insects in 

 the interior of the mass to pay for the fumigation, even if the mass 

 is entirely open to the air above and around it. The husks in so large 

 a mass serve to retain the gas long enough to kill weevils, etc., but it 

 Avould be better in this case to increase the amount of disulphid to 

 25 or 30 pounds, dividing it into two equal lots and applying one lot 

 at first and then the other after an interval of an hour. The liquid 

 may be poured directly on the grain, as it will not injure it for feed- 

 ing purposes or in germination. It is hardly possible thus to treat 

 husked, or even shelled, corn without having a tight room or bin in 

 which to do the work. 



In fumigating corn in the crib or storage room it is best to level off 

 the corn and then, if the husk is on, to throw out enough ears to 

 leave five shallow holes in quincunx arrangement (i. e., one at each 

 corner of a square and one in the center, thus: l»l). If the surface 

 area of the stored corn is oblong it may be divided approximately into 

 squares and five holes, arranged as indicated, made in each square. A 

 proportional part of the entire dosage is then poured into each hole 

 and the ears quickly replaced. The room should be closed as tightly 

 as possible, and it may be left closed indefinitely. The best results 

 are obtained by doing this work when the temperature is above 

 75° F. Fumigation should begin at about 10 or 11 o'clock in the 

 morning, so that the warmer temperature of midday may increase 

 the effectiveness of the gas. 



Cowpeas and other leguminous seeds can be stored and fumigated 

 conveniently in water-tight barrels, which are filled with the seed to 

 within a few inches of the top. The dosage needed, about | cupful 

 per barrel, may be poured directly upon the peas or into absorbent 

 material packed on top of them. The barrel then should be covered 

 with a double thickness of heavy wrapping paper tied closely and 



1 Husk corn in the field. — In the Southern States it has been long the prevaUing 

 custom to gather the corn by breaking the ear from the stall? and to store it with the 

 husk on. For several reasons insect injury during storage is generally far greater in 

 the South than it is in the North. Storing corn with the husk on has been supposed to 

 protect it against insect attack in some measure. Recent investigations have shown that 

 this is a mistake in practice. The insect attack begins in the field as soon as the kernels 

 begin to harden and the husk to shrink away from the ear. Storing with the husk on 

 insures carrying practically every insect from the field to the crib. It practically doubles 

 the volume of storage room required per bushel of corn and also increases greatly the 

 amount of carbon disulphid needed to treat the corn in the crib. Husking the corn in 

 the field, on the other hand, will leave at least three-fourths of the adult insects in the 

 field and thus help greatly in reducing subsequent injury during storage, besides making 

 crib treatment more effective and economical. 



There is no need for an open crib in which to store the thoroughly well-matured corn 

 of the South. Storage rooms may be made tight enough for fumigation and the dosage 

 required for bare ears will be only about 10 pounds per 1,000 cubic feet, or one-half the 

 amount needed with the husk on. Store as soon as the corn is thoroughly matured and 

 fumigate promptly for best results. If insect attaci* develops in the crib, treat again, 

 using a heavier dosage, or doing the work during- warmer weather. 



