Circular [1917]

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E. LEE WORSHAM, State Entomologist, Atlanta, Ga.

CIRCULAR

No . 22

Control of Insects Attacking Stored Products
There are several very serious insects infesting stored grain, seeds, etc. , in Georgia and all sout hern states. They are capable of destroying the entire crop unless we know how to control them.
There are four distinct species of weevils: the Granary weevil, the Rice weevil, Saw-toothed Grain beetle and red or Square-necked Grain beetle, and one moth known as Angumois grain moth, that do serious damage to corn, wheat, peas, and other seeds.
The weevils are easily recognized and no descriptions are necessary. The Angumois grain moth is a small whitish colored moth that somewhat resembles the clothes moth. The eggs are laid by the moths on the grain, and the young caterpillars hatch and bore to th e interior of the grain.

REMEDIES.

The standard remedy for these pests is carbon bisulphide, a liquid that

can be obtained at any drug store. When exposed to air it volatilizes or

changes into a gas which is heavier than air. Best re sults a re obtained

with corn, grain, peas, etc., when they are placed in a more or less air-tight

bin , crib, or warehouse. This gas penetrates very readily, and grain or

other crops can be fumigated in bulk or in sacks. In fumigating, th e fir st thing t o do is to estimate the cubical contents
of the space occupied by the grain, by multiplying the three dimensions together. If the bin or crib is practically air-tight, use 5 to 8 pounds of

carbon bisulphide f or each 1,000 cubic feet of space occupied by the grain,

oth er wise use 20 t o 25 pounds to ea ch 1,000 cubic feet of space.

In using carbon bisulphide on corn in storage houses the corn should be

leveled, and holes prepared about a foot deep by pulling out the ea r s at intervals of four feet each way. Divide the carbon bisulphide to be applied

among these holes. Begin farthest from, and work toward the door. Pour the liquid directly into the holes, and fill them immediately with corn to

confine the fumes. Th e liquid will not hurt the grain either f or fo od or

for seed. Precaution. Carbon bisulphide when mixed with air forms a gas th at

may be exploded by any kind of flame or at a temperature of over 295 de -

grees without any flame . In general it is not more danger ous th an gasoline. but all precautions sh ould be taken in r eg ar d to fire. Unless inhaled f or a

considerable length of time, no h armf ul effects sh ould f ollow its use.

F or f ur th er inf orma ti on concernin g ins ects or di sease s a ttacking the

differ ent cro ps, write Sta t e E nt om olog ist. Atlant a, Ga.

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GENER AL LI BRARY

THE UNIVERSITYI OF G EORG~

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