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Bionomics of the Maize Borer, Chilo Partellus (Swinhoe), in Nepal

  • Fanindra P. Neupane
  • H. C. Coppel
  • R. K. Chapman
Research Article

Abstract

In the Chitwan valley, Nepal, Chilo partellus preferred maize and sorghum over rice, teosinte, finger millet and sugar-cane. Infestation on young maize plants produced “dead hearts” and on older plants reduced growth and sometimes prevented cob formation. The yield reduction in some maize cultivars reached 60% and stem infestation levels reached 98%. Borers produced “dead hearts” in young and “whiteheads” in older rice plants.

The egg, larval and pupal periods from April through September lasted 4–5, 16–41 and 4–8 days, respectively. A complete generation took 28–48 days under summer field conditions and 192–233 days from October to May. Of the one egg, four larval and two pupal parasitoids, all hymenopterans, which were reared from C. partellus, the two most important were Trichogramma chilonis (70% egg parasitism) and Apanteles flavipes (30% larval parasitism).

Key Words

Chilo partellus maize borer life history behaviour parasitism 

Résumé

Dans la vallée du Chitwan au Népal, le Chilo partellus a préféré le mais et le sorgho plus que le riz, le téosinte, le millet (finger millet) et la canne à sucre. L’infestation des jeunes plantes à produit des “dead hearts” et a réduit la croissance dans les plantes plus âgées et parfois empêchait la formation des épis. La réduction de la production de certains cultivars de mais a atteint 60% et les niveaux d’infestation des tiges à atteint 98%. Les rongeurs produisent des “dead hearts” dans les jeunes plantes de riz et des “white heads” dans les plantes plus âgées.

L’oeuf, les périodes larvaires et nymphales à partir d’avril jusqu’en septembre ont duré 4–5, 16–41 et 4–8 jours respectivement. Une génération complète a pris 24–28 jours dans les conditions d’été et 192–233 jours pendant la période octobre-mai. D’un oeuf, 4 parasitoides larvaires et 2 parasitoides nymphales, tous les hymnéoptères qui ont été élevés à partir du C. partellus, les 2 plus importants étaient Trichogramma chilomis (70% parasitisme de l’oeuf) et Apanteles flavipes (30% parasitisme larvaire).

Mots Clefs

Chilo partellus rongeur de mais historique de la vie comportement parasitisme 

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Copyright information

© ICIPE 1985

Authors and Affiliations

  • Fanindra P. Neupane
    • 1
  • H. C. Coppel
    • 1
  • R. K. Chapman
    • 1
  1. 1.Department of EntomologyUniversity of WisconsinMadisonUSA

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