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Seasonal bionomics of Heliothis armigera (Hubner) (Lepidoptera: Noctuidae) in the Terai Belt of northeastern Uttar Pradesh

Published online by Cambridge University Press:  19 September 2011

S. R. Tripathi  and
Rajesh Singh
S. R. Tripathi
Affiliation:
Department of Zoology, University of Gorakhpur Gorakhpur-273009, India
Rajesh Singh
Affiliation:
Department of Zoology, University of Gorakhpur Gorakhpur-273009, India
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Abstract

Heliothis armigera (Hubner) completed five generations in the laboratory, as well as in the field, in a year. The first generation was completed from the first week of December to the fourth week of February, the second generation from the second week of February to first week of April. The third generation from third week of August passing through the extreme summer, the fourth generation during monsoon period and the fifth last generation from the third week of September to the fourth week of November. The seasonal variation in generation time is largely due to extreme variations in ecological factors, temperature (10–45°C), photoperiod (10–14 hr), relative humidity (15–95%) and rainfall. These factors also affect the percentage of pupation, emergence and fecundity of the female moths. Males outnumbered the females in the first, second and fifth generation. The females lived longer than males in all generations.

Résumé

Heliothis armigera (Hubner) comporte 5 générations par an aussi bien en laboratoire que dans les conditions naturelles. La première génération est achevée entre la première semaine de décembre et la quatrième semaine de février, la deuxième entre la seconde semaine de février et la première semaine d'avril. La troisième génération a partir de la troisième semaine d'août et à travers les conditions rudes de l'été; la quatrième génération pendant la période de la mousson et la cinquième et dernière génération, entre la troisième semaine de septembre et la quatrième semaine de novembre. La fluctuation saisonnière quant à la durée d'unegénération est essentiellement liée à la variation extrême dans les facteurs écologiques: température (10–45°C), la photopériode (10–14 h), l'humidité relative (15–95%) et la pluviométrie. Ces facteurs affectent également le pourcentage de pupaison et d'émergence, et la fécondité des femelles. Les mâles surpassent en nombre les femelles dans la première, deuxième, et cinquième génération. Les femelles vivent plus longtemps que les mâles quelque soit la génération consideréd.

Keywords

LepidopteraNoctuidaeHeliothis armigeraseasonal bionomicsLepidopteraNoctuidaeHeliothis armigerabionomie saisonnière
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 14 , Issue 4 , August 1993 , pp. 439 - 444
Copyright
Copyright © ICIPE 1993

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