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Palorus subdepressus

Palorus subdepressus, the Depressed Flour Beetle 

The depressed flour beetle, Palorus subdepressus, is a minor pest of fine materials such as flour, and mouldy or damaged grains.

It can be found worldwide however it prefers warmer temperatures. Both adult and larvae will consume damaged stored products.

The overall quality and market value of the stored food is reduced by the presence of these organisms.

 


Adult Palorus subdepressus, depressed flour beetle.

[Image credit: United States Department of agriculture, Agricultural research service]

 

 

 

Biology of Palorus subdepressus, The Depressed Flour Beetle.

 

Larva Palorus subdepressus, depressed flour beetle.

[Image credit: United States Department of agriculture, Agricultural research service]

 

 

Adult depressed flour beetles are red-brown in colour. They grow between 2.5 and 3mm in length.

Palorus subdepressus adults live for up to 6 months.

Mature females can lay up to 650 eggs in a lifetime. When the eggs hatch into larvae they start off near transparent.

Later they develop into a yellow-brown colour during growth. They then pupate over 4 days and emerge as adults.

The whole lifecycle will occur in the food source.

 


Life cycle of the depressed flour beetle.

 

Damage caused by Palorus subdepressus, The Depressed Flour Beetle.

Though these organisms can consume processed grains, if they are found infesting whole grain it is often a sign that there is an infestation of other species. These include species which can bore into wholegrain and break it down.

They are also an indicator of poor and damp storage as they also feed on the mould that develops on the product.

Contaminants will include faeces of the insect, larval skins and the bodies of deceased adults.

 

 

 Pheromone traps for Palorus subdepressus, The Depressed Flour Beetle.

 Russell IPM manufactures and supplies a complete monitoring system, Xlure-MST for Palorus subdepressus.


This trap can be used to assess the severity of an infestation of Palorus subdepressus before it becomes serious.


It can also be used to monitor the effectiveness of any control measure being used to treat an infestation of Palorus subdepressus.


The Xlure-MST is a multispecies trap based on insect pheromones and food lures.

 

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