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Effects of the juvenile hormone mimic pyriproxyfen on egg development, embryogenesis, larval development, and metamorphosis in the desert locust Schistocerca gregaria (Orthoptera : Acrididae)

Vennard, C. and Nguama, B. and Dillon, R. J. and Oouchi, H. and Charnley, A. K. (1998) Effects of the juvenile hormone mimic pyriproxyfen on egg development, embryogenesis, larval development, and metamorphosis in the desert locust Schistocerca gregaria (Orthoptera : Acrididae). Journal of economic entomology, 91 (1). pp. 41-49. ISSN 0022-0493

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Abstract

The juvenile hormone mimic pyriproxyfen disrupted embryogenesis when applied topically to eggs of the desert locust Schistocerca gregaria Forskal. Eggs treated on days 3-6 were inhibited at various stages of development, depending on dose and age. In particular, 0.001-0.01 mu g blocked development of 3- and 4-d-old eggs at blastokinesis. Treatment of 7- to 11-d-old eggs was ineffective up to 10 mu g. Insects that hatched successfully failed to display any postembryonic defects. Topical application of the mimic to females had a small ovicidal effect. The metamorphic molt was disrupted when the mimic was applied topically to 5th-instar S. gregaria. Insects retained characteristics of the 5th instar and in extreme cases supernumerary 5th instars were formed. Additional defects included essentially normal adults that were malformed and could not fly. Oral doses were considerably less effective. Application to 4th-instar nymphs did not produce supernumerary characteristics in postecdysial insects, though a large proportion of insects showed abnormalities when they reached adult, which in some cases prevented night. Topical application of the mimic to 5th instar affected the length of the instar. The effects depended on dose and day of treatment.

Item Type: Article
Journal or Publication Title: Journal of economic entomology
Subjects: Q Science > QR Microbiology
Departments: Faculty of Health and Medicine > Biomedical & Life Sciences
ID Code: 57953
Deposited By: ep_importer_pure
Deposited On: 19 Oct 2012 09:06
Refereed?: Yes
Published?: Published
Last Modified: 10 Apr 2014 00:05
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/57953

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