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Evaluation of Juvenoid Insect Growth Regulators on Schistocerca Americana

Published online by Cambridge University Press:  19 September 2011

William S. Bowers  and
Felix Ortego
William S. Bowers
Affiliation:
Department of Entomology, Forbes Building, The University of Arizona, Tucson, Arizona 85721, USA
Felix Ortego
Affiliation:
Department of Entomology, Forbes Building, The University of Arizona, Tucson, Arizona 85721, USA
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Abstract

Three aromatic juvenoids were evaluated for morphogenetic activity on Schistocerca americana. Fenoxycarb, the most active insect growth regulator examined, was found to induce a significant mortality in developing fifth stage nymphs and caused severe morphogenetic damage during ecdysis to the adult. Juvenoid treatments were also observed to increase the duration of the last nymphal stage and to induce chromotropic colour changes similar to that observed in the solitary phase of the desert locust, Schistocerca gregaria Forskal.

Résumé

Une étude a été menée sur trois juvénoïdes aromatiques pour en évaluer l'activité morpho-génétique sur la Schistocerca americana. Le fenoxycarb, le plus actif des régulateurs de croissance d'insectes étudiés, s'est révélé capable de provoquer un taux de mortalité très importante parmis les chrysalides à cinquième étape de croissance, et de causer d'importants dégâts morpho-génétiques au cours de la dernière étape consistant au passage de l'état de chrysalide à l'état d'insecte adulte.

On a également procédé à des traitements aux juvénoïdes pour prolonger la durée de la dernière étape de la chrysalide et provoquer ainsi des changements des couleurs chromatropiques semblables aux changements observés chez la sauterelle du désert, la Schistocerca gregaria Forskal lors de la phase solitaire.

Keywords

Juvenile hormonejuvenoidlocustmorphogenetic damageSchistocerca americana
Type
Articles
Information
International Journal of Tropical Insect Science , Volume 12 , Issue 1-2-3: Current Topics in Tropical Entomology , June 1991 , pp. 71 - 75
Copyright
Copyright © ICIPE 1991

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References

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