Laboratory studies on the development, survival, mating behaviour and reproductive capacity of the rice moth, Corcyra cephalonica (Stainton) (Lep., Galleriidae)

Abstract

Development of the rice moth, Corcyra cephalonica (Stainton), from first instar larvae to adults in a whole wheat flour medium, took 40.9 and 43.5 days for males and females, respectively. Adult longevity was 9.1 and 7.0 days for mated and virgin males; 8.3 and 8.0 days for mated and virgin females, respectively. Virgin females laid more eggs than mated ones and as the number of moths per cage increases, the number of eggs decrases. Maximum mating response occurred during the second night after emergence. The mean number of matings per female was 0.9. The mean number of matings per male was 3.2 while that for females was 1.2 at a sex ralio of 4♀:1 ♂. Multiple mating occurred among about 16 % of the females. All investigations were carried out, at 28 °C, 65 % relative humidity, and LD 14:10 h. Zusammenfassung Laboruntersuchungen zu Entwicklung, Überleben, Kopulation und Reproduktion der Reismotte, Corcyra cephalonica (Stainton) (Lep., Galleriidae) Die Entwicklung der Reismotte, C. cephalonica, dauerte von der Erstlarve bis zum Falter in Weizenmehl 40,9 bzw. 43,5 Tage für Männchen und Weibchen. Die Falter‐Lebensdauer betrug 9,1, und 7,0 Tage für kopulierte und nicht kopulierte Männchen bzw. 8,3 und 8,0 Tage für entsprechende Weibchen. Unbefruchtete Weibchen legten mehr Eier ab als befruchtete. Mit Zunahme der Falterzahl pro Käfig nahm die Zahl der Eier ab. Das Kopulationsmaximum zeigte sich während der 2. Nacht nach dem Schlüpfen. Die mittlere Zahl an Kopulationen pro Männchen betrug 3,2 und für Weibchen 1,2 bei einem Verhältnis von 4:1 zugunsten der Männchen. Mehrfachkopulation zeigten etwa 16 % der Weibchen. Alle Untersuchungen fanden bei 28,0 °C, 65 % rel. Luftfeuchte und 14:10 h Licht/Dunkelheit statt.

Comparison of artificial diets for rearing Corcyra cephalonica (Stainton, 1865) (Lep., Pyralidae) for Trichogramma mass production

“…Both sexes were equally affected, since the sexual ratio was close to 0.5 (1% : 1&) on the 6 diets studied. These values were close to those found by Kamel & Hassanein (1967) and Cox et al (1981) and Etman et al (1988), who obtained a sexual ratio close to 1:1.…”

Determination of Suitable and Economical Diet for Laboratory Rearing of Rice Moth, Corcyra cephalonica (Stainton)

“…5 days. Etman et al, (2009) also observed that adult longevity was 9.1 and 7.0 days for mated and virgin females, respectively, on wheat flour medium. The fecundity of rice moth, Corcyra cephalonica (Stainton.)…”