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Angoumois grain moth


Key features

The adult open wing span is 10 to 23 mm.


Adult moths have pale yellow forewings and grey pointed hindwings. The wings are narrow with wide fringes.


In common with other moth species, wing scales are readily lost and wing pattern is therefore an unreliable characteristic for identification.


Positive identification requires the study of adult characters such as wing venation, head appendages and abdominal structures for which a stereoscopic microscope is necessary.


Biology

The female lays up to 400 eggs.

Larval and pupal stages are spent within the grain. Maize may support the development of up  to 3 larvae per grain but smaller grains support a single larva.

In common with other insects, development times are influenced by temperature, relative humidity, moisture content, quantity and quality of food. The following figures are therefore only a guide.


Number of days spent as:

Egg...............................................5-10

Larva............................................10-16

Pupa.............................................7-40


Eggs will hatch at temperatures above 12°c and the species is able to survive winters in UK. The minimum temperature for population increase is 16°c.

The optimum relative humidity for development is 75-80%.

Total development times at 70-90% relative humidity are approximately 30 days at 30°c and 40 days at 25°c .

In colder climates, the larva may remain dormant for up to 20 weeks and extend the life cycle to 6 months.


Distribution

The origin of the common name of this moth is as a results of early reports of it causing damage in the French province. However it is now a cosmopolitan stored product moth.


Significance

It requires whole grain or caked material to develop.

By preference the female lays her eggs in barley, rye, corn, oats, rice and various seeds.

Development of a angoumois grain moth infestation causes considerable heating and increase in moisture content of grain.


Control

Please call East Lancashire Pest Control on 0800 023 6116