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The Effects of Precocenes in Grasshoppers Heteracris Littoralis (Orthoptera: Acrididae)

  • Hussain F. Alrubeai
Research Article

Abstract

Prococenes I or II (20–100 μg/insect) were topically applied to third instar nymphs of the grasshepper, Heteracris littoralis. Both compounds led to different degrees of precocious metamorphosis, irreversible with time, at the subsequent moults. Precocene-treated third instar nymphs gave rise to precocious adults at the following moult, though some of the nymphs responded and metamorphosed precociously in the fifth instar. Ovarian development was inhibited by precocene II. Meanwhile, juvenile hormone (20 μg/insect) restored normal ovarian development to some extent.

Key Words

Heteracris littoralis precocene precocious metamorphosis ovarian retardation juvenile hormone III 

Résumé

Le précocène I ou II (20–100 μg/insecte) ont été localement appliqué pour nymphes au 3eme stade de Heteracris Littoralis.

Les resultats avec l’un ou l’autre composé conduit pour different metamorphose précoce, irreversible avec le temps, en subsequante mue. Bienque, la 3eme stade treatee par le précocène donne qulques adultes précoce en mue suivante, authre percentage de nymphes ăa répondre et metamorphose précoceté dans la 5eme stade. L’utilisation de precocene II a montré en empêchement le developpment d’ovariane. En même temps, JH III (20 μg/insecte) a paru remettre le developpment d’ovariane jusqu’a sertain niveau.

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Copyright information

© ICIPE 1986

Authors and Affiliations

  • Hussain F. Alrubeai
    • 1
  1. 1.Department of Plant Protection, Faculty of Agriculture and BiologyNuclear Research CenterBaghdadIraq

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