Control of insect pests in grains stored in insecticide impregnated jute bags.

Five chemica1s, commonly used for grain fumigation, were injected into grain stored
under non-airtight conditions, in insecticide-impregnated jute bags. The effect of the
chemicals on the insects present in the grain was studied and it was found that ethylene
dibromide, when used at the rate of 10 c.c. per 200-lb. bag, completely controlled the insects.
Injection of the chemical in either horizontally or vertically placed bags and at one or two
places in the same bag gave similar results. For bags arranged in stacks, a dose of 71/2 c.c.
of the chemical per ,200-lb. bag was found necessary for obtaining complete mortality of
the insects. Injection of ethylene dibromide into unimpregnated bags also removed the
insects from the bags, but the results suggested that some insects escaped death.
The quantities of the chemical sorbed by the grain are mentioned and shown to be
within the permissible limits.