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Outline modern ways of controlling grains pest in storage

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- Use of storage bags
This method consists of conserving dried and cleaned grain in bags made of plant fibre
or plastic, and neatly stacking the bags in carefully prepared areas. This method is little
used in developed countries but is widespread in developing countries. It is economical
and well-adapted to local grain-transport and marketing conditions. There are several
ways of storing grain in bags. The bags of grain can be stacked out-of-doors under
tarpaulins, or placed inside storehouses, sheds or warehouses. Sometimes, especially
for seeds, grain is stored in bags in refrigerated warehouses.
- Treatment of premises
Before any application of insecticide to storage buildings (warehouse, silo), the entire
premises must be thoroughly cleaned. The range of available insecticide products is
broad enough to treat different surfaces accordingly.

- Treatment of grain with contact insecticide
This consists of covering the grain with a film of insecticide that acts on contact with
insects, with effects that vary in rapidity and persistence. For grain that is to be stored
in bulk, the insecticide is incorporated directly into the grain by spraying before the silos
are filled. For storage in bags, previously cleaned grain is mixed with powder or sprayed
before bagging. The machinery used for dusting grain can range from the simple
mechanical duster to motorized dusters; however, with this type of equipment the grain
is not treated uniformly, some areas receiving more dust than others. In big storage
centers, in order to obtain an even more regular distribution and a good coating of
insecticide, the grain is fine-sprayed by a compressor equipped with a mist nozzle.

- Treatment of grain by fumigation
Fumigation is a treatment that rids stored grain of insects by means of a poisonous gas
called a fumigant. This substance, produced and concentrated as a gas, is lethal for
specific living species. Unlike contact powders, the fumigant penetrates to the interior
of the grain mass and reaches the largely invisible incipient forms (eggs, larvae)
developing there. Fumigants spread throughout the area where they are released;
therefore their use requires that the enclosure concerned be totally sealed off. Thus,
when grain stored in bulk is fumigated, the bins must be perfectly airtight.

NatalieR answered the question on May 24, 2022 at 06:57

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Outline modern ways of controlling grains pest in storage

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