Stored Product Insects
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Grain Weevil – Sitophilus granarius

General
The adult is 2mm-4mm long with a dark brown, elongated, cylindrical body. The head has a snout like prolongation with mouthparts at the tip. The antennae are elbowed with a club. Similar in appearance to the Lesser and Greater Rice Weavils
but lacks the dull brown spots on the wing covers. The adult is wingless. The larva is 3mm-4mm long with a white, fleshy, crescent-shaped body and has no legs.

Significance
Primarily found on wheat and barley, it will also breed on hard cereal products such as spaghetti, and is an important pest of all kinds of cereals.

Control
As the development stages occur within the grain, an infestation may remain undetected until adult emergence. Start with identifying the source of the infestation and the extent of product contamination. Infested foodstuffs should be isolated and destroyed, or failing this fumigated. Treatment of all the fabric of the building should be carried out using a residual synthetic pyrethroid insecticide, supplemented with an ultra-low volume insecticide application. Attention to hygiene is important so as to remove food residues. Furthermore, as these insects are prolific breeders, a thorough treatment is essential.       

Number of days spent as:

Egg 3-21
Larva 20-143
Pupa 4-23
Adult 210-260
 

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