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.
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Bowers, W.S., Ortego, F. Evaluation of Juvenoid Insect Growth Regulators on Schistocerca Americana. Int J Trop Insect Sci 12, 71–75 (1991). https://doi.org/10.1017/S1742758400020555
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DOI: https://doi.org/10.1017/S1742758400020555