- The scientific
storage of grains help in minimising the damage by insects, and microorganisms.
The following methods can help in safe storage of grains.
the storage structures, sealing of cracks, crevices and holes present
in the floors. Cleaning of the Sheller before their use.
structures/godowns/gunny bags should be disinfected with approved residual
insecticides preferably with Malathion 50% EC, with dilution 1 : 100.
stacking of the filled bags for proper hygiene and sanitation prevents
insect damage in the godowns.
The infestation of stored grain insect pests can be minimized
by different methods
Physical control measures
treatment of stored grain at 55-60°C
of inert dusts with grain makes entry of insects a difficult task. However
here grain has to be washed before consumption.
measures are practicable and include sieving of grains.
moisture content of grain and availability of oxygen have to be suitably
manipulated by designing and constructing the storage structures which
create unfavourable ecological conditions for insect attack.
- Food grains
kept in airtight sealed structure remain insect free. Eg. Pusa bin.
with moisture content less than 10% are not suitable for multiplication
and survival of most of the insects (except Khapra beetle which can
survive but it is susceptible to reduced oxygen content.)
Chemical control measures
measures are more popular and effective. They may be used as prophylactic
and curative treatment.
insecticide treatments are to prevent the insect infestation and cross
infestation. However insecticide should not be sprayed on food grain
- The insecticides
and their concentrations recommended for prophylactic treatment of stored
grain are Malathion 50 E C at 0.5%, Pxrimiphos methyl 50% EC at 0.5%
of chemicals with food grains meant for human consumption is not recommended.
However they can be mixed with grains meant for seed purpose only. Normally
pyrethrum dust is used as seed protectant.
is the best method for controlling stored insects. However, the fumigation
of grains should be carried out under expert supervision and proper
- In our
country, EDB and EDCT have been recommended for fumigation of food grains.
These fumigants should be handled with great care and by trained staff