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

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 microgram blocked developm...

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Bibliographic Details
Published in:Journal of economic entomology 1998-02, Vol.91 (1), p.41-49
Main Authors: Vennard, C. (University of Bath, Bath, UK.), Nguama, B, Dillon, R.J, Oouchi, H, Charnley, A.K
Format: Article
Language:English
Subjects:
Biological and medical sciences
BIOLOGICAL DEVELOPMENT
Control
DOSAGE EFFECTS
EMBRYONIC DEVELOPMENT
Fundamental and applied biological sciences. Psychology
HATCH
INSECT CONTROL
Integrated pest control
METAMORPHOSIS
ORAL ADMINISTRATION
OVIPOSITION
Phytopathology. Animal pests. Plant and forest protection
Protozoa. Invertebrates
REPRODUCTIVE PERFORMANCE
SCHISTOCERCA GREGARIA
SUBLETHAL EFFECTS
SYNTHETIC PYRETHRINS
TOPICAL APPLICATION
TOXICITY
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Summary: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 microgram blocked development of 3- and 4-d-old eggs at blastokinesis. Treatment of 7- to 11-d-old eggs was ineffective up to 10 micrograms. 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 flight. Topical application of the mimic to 5th instar affected the length of the instar. The effects depended on dose and day of treatment
ISSN:0022-0493
1938-291X
DOI:10.1093/jee/91.1.41