Internal Feeders of Stored Grains and their Management

Internal Feeders of Stored Grains and their Management

Hi, friends. Welcome to the agrifunda today post  on ‘Internal Feeders of Stored Grains and their Management’. What
are internal feeders. Internal feeders are those, they feed on the internal contents of the grain or seeds or kernel. These feeders, they destroy more than they eat. All the internal feeders, they lay eggs on seeds or kernel or grain. On hatching, grub or larva enters into the grain or seeds or kernel, and feeds on
internal content of the grain. After feeding it pupates inside the grain or seeds or kernel.

Internal Feeders of Stored Grains and their Management


Internal Feeders of Stored Grains and their Management


comes out from the grain or seeds or kernel by making a hole on it. Some of the common internal
feeders are, rice weevil, lesser grain borer, cigarette beetle, drug store beetle, pulse beetle, tamarind
beetle and Angoumois grain moth.
Let us understand these pests in detail. We will start with rice weevil. That is sitophilus oryzae. It belongs to the family Curculionidae of the order Coleoptera. It attacks almost all cereals. Adult is reddish
brown in color with long snout. Due to feeding, irregular hole can be seen on the grain. Then another internal borer is, lesser grain borer. It is Rhyzopertha dominica. It belongs to family Bostrychidae of the
order Coleoptera. Like rice weevil it also attacks almost all cereals. Adult is reddish brown in color, and
head is projected downward beneath the thorax. Then tip of the abdomen is blunt. Due to feeding on
cereals, you can see the circular hole on the grain. Pulse beetle.

Scientific name is Collasobruchus
chinensis. It belongs to the family Chrysomelidae, of the order Coleoptera. It almost attacks all the
pulses. Adult can be easily recognized by the presence of ivory spots on the dorsal region of the body.
Due to feeding on seeds you can see the circular exit hole.
Then cigarette beetle, that is Lasioderma serricorne. It belongs to family Ptinidae of the order
Coleoptera. It attacks ginger, turmeric, chilli including cigarette. Adult is reddish brown in color.

Body is hump like. Then another internal borer is drug store beetle. That is Stegobium paniceum. It belongs to
family Ptinidae of the order Coeloptera. It also attacks ginger, turmeric, coriander including drug.
Then groundnut beetle. Scientific name is Caryedon serratus. It belongs to family Chrysomelidae of the order
Coleoptera. In addition to groundnut, it also attacks tamarind. Then another internal borer is Angoumois
grain moth. Scientific name is Sitotroga cerelella. It belongs to family Gelechiidae of the order
Lepidoptera.

 This is the only Lepidopteran insect, which acts as a internal feeder on grains or seeds.
Then coming to management of internal feeders of stored grains. As a preventive measure, before
storage of grains or seeds; bring down the moisture content to less than 10%. Then maintain the
hygiene in the storehouse by plugging cracks, crevices, holes in the godown. Then remove all the debris
and clean the storehouse before storage. Then disinfect empty godowns or container by spraying
Malathion @ 10ml per liter. Maintain good storage condition by providing dunnage and leave gangways
all around. If seeds are meant for seed purpose, coat the seeds with edible oils or castor oil or neem oil
@ 5ml per kg of seeds. Or mix the seeds with dried neem leaves, or Acorus calamus powder @ 10g per
kg seeds, or Malathion 5% dust @ 250g per quintal of seeds. Against pulse beetles, cover the seeds with
7cm layer of sand or saw dust or dung ash on the top, if seeds are stored in bulk.

Store the seeds or grains in the insect proof bins or bags. So here you can see the insect proof bins and
bags. Insect proof bins are available in the market. Most common or popularly used bin is Pusa bin. Then
insect proof bags are available, like HDPE bags, grain pro bags, zerofly bags.

Then as a curative measures, go for regular inspection of godown. If infested, dry it under sun regularly.
If infestation is severe, then go for fumigation of godowns with either Methyl bromide or aluminium
phosphate tablets. Or go for alteration carbon-di-oxide or oxygen levels in the storage or godown.
Thank You.

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