Precocene II-Induced Effects in the Aphid Aphis Craccivora Koch.

  • U. S. Srivastava
  • A. K. Jaiswal
Research Article


Adult (2–20 hr old) viviparous Aphis Craccivora were treated with 0.5 to 4.0 jig of precocene II. Treatment led to dose-related reduction in the progeny number, survival and life span of the aphid, but wing development was not affected. With 2.0 (μg/aphid or more of precocene II, all surviving offsprings shared precocious metamorphosis, but even with 0.5 μg/aphid, about 20% progeny showed such metamorphosis with 1.0 and 1.5 μg/aphid. Early nymphs tend to undergo precocious metamorphosis earlier, in the second moult.

Key Words

Aphis craccivora precocene II precocious metamorphosis wing development 


—Des adultes vivipares des aphides, Aphis Craccivora, dont Tage varie entre 2 a 20 heures ont ete traite avec 0.5 a 4.0 (ig de prococene II par aphide. Le traitement a induit en relation avec le dosage une reduction du nombre des descendants, leur longévité et période de survie sans en affecté le développement des ailes. Les descendants qui ont survécu une dose de 2μg de precocene par aphide ont subit une metamorphose précoce, qui fut plus importante chez la progeniture qui a ete traite avec 1.0 a 1.5 μg par aphide. Les nymphes mise bas d’une manière hâtive ont tendance a subir une metamorphos viz. precoce pendant la deuxième mue.

Mots Clefs

Aphis craccivora precocene II metamorphose précoce développement des ailes 


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Copyright information

© ICIPE 1989

Authors and Affiliations

  • U. S. Srivastava
    • 1
  • A. K. Jaiswal
    • 1
  1. 1.National Academy of SciencesAllahabadIndia

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