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Precocene II-Induced effects in the aphid Aphis craccivora Koch.

Published online by Cambridge University Press:  19 September 2011

U.S. Srivastava
Affiliation:
National Academy of Sciences, India 5, Lajpatrai Road, Allahabad-211002, India
A.K. Jaiswal
Affiliation:
National Academy of Sciences, India 5, Lajpatrai Road, Allahabad-211002, India
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Abstract

Adult (2–20 hr old) viviparous Aphis craccivora were treated with 0.5 to 4.0 μg 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.

Résumé

Des adultes vivipares des aphides, Aphis craccivora, dont l'age varie entre 2 a 20 heures ont ete traite avec 0.5 a 4.0 μg de prococene II par aphide. Le traitement a induit en relation avec le dosage une reduction du nombre des descendants, leur longevité et periode de survie sans en affecté le developpement des ailes. Les descendants qui ont survecu une dose de 2 μg 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 hative ont tendance a subir une metamorphos viz. precoce pendant la deuxième mue.

Type
Research Articles
Copyright
Copyright © ICIPE 1989

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