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2010年47 No.3
nfluence of moisture of maize flour on the development and reproduction of Rhyzopertha dominica
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Key Words：Rhyzopertha dominica, maize flour, moisture, development, reproduction
Abstract： The effect of the moisture content of maize flour on the development and reproduction of
Rhyzopertha dominica (Fabricius) was investigated. The results show that the moisture content of maize flour had a significant influence on the developmental duration of larvae, but no obvious influence on that of eggs and pupae. The survival rate of eggs, larvae and pupae increased as the moisture content of maize flour increased from 10.98% to 19.35%，but decreased when this reached 21.33%. The number of larval instars was influenced by flour moisture content, ranging from 3 to 5 at 19.35% moisture but from 3 to 8 at 10.98% moisture. Female insects laid eggs only when the moisture content was 19.35% and 18.67%, and that the average daily number of eggs and average oviposition time per female was greater at 19.35% than at 18.67% moisture.