Servicio de Información Comunitario sobre Investigación y Desarrollo - CORDIS

Model of the rate of increase of insect populations on malting barley related to grain Aw and temperature

Model of the rate of increase of insect populations on malting barley related to grain Aw and temperature, with a link to the impact of high levels of infestation on changes in malt and beer quality criteria.

In using published results and previous work on population dynamics of insects in wheat, predictive models of population dynamics of harmful insects for barley were established.

The application of these models to current malting barley storage was examined using laboratory and pilot scale experimental studies on the two main insect species that represent a risk of quality deterioration in stored malting barley: the granary weevil, Sitophilus granrius, and the saw-toothed grain beetle, Oryzaephilus surinamensis.

The models were established within a range of temperature and grain moisture content of 15-30°C and 12.5-15.3% (wet basis), respectively.

The pilot scale trial of malting barley storage lasted 8 months with the two conditions: infested batches compared to the uninfested ones. Quality criteria of grain and malt were assessed immediately before bin loading and at the end of the storage period.
Excepted in one situation with high moisture content (15.3%) and infested grain batch, both germination and all quality criteria of malt were not affected during the storage period.

These results were used in the DSS knowledge base in order to take into account the risk of damage of stored product insects on the quality of seeds or malt in the planning of optimal storage route.

Reported by

Institut National de la Recherche Agronomique
CR INRA - 71 Av. Edouard Bourleaux
33883 Villenave d'Ornon
France
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