Pyriproxyfen effects on newly engorged larvae and nymphs of the lone star tick (Acari: Ixodidae)

Newly engorged larvae and nymphs of the lone star tick, Amblyomma americanum (L.), were exposed to 9 treatments of pyriproxyfen in glass vials consisting of dosages of 4, 8, and 16 micrograms/cm2 for 7 d, 14 d, and continuous exposure periods at each concentration. Treatment of newly engorged larvae...

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Bibliographic Details
Published in:Journal of medical entomology 1997-03, Vol.34 (2), p.206-211
Main Authors: Donahue, W.A. (Texas AandM University, College Station, TX.), Teel, P.D, Strey, O.F, Meola, R.W
Format: Article
Language:English
Subjects:
Acari
ADULTE
ADULTOS
AMBLYOMMA AMERICANUM
Animals
Biological and medical sciences
CONSOMMATION
CONSUMO
CONTROL DE PLAGAS
DEFECACION
DEFECATION
FERTILIDAD
FERTILITE
Fundamental and applied biological sciences. Psychology
INHIBICION
INHIBITION
Ixodidae
Juvenile Hormones
Larva
LARVAS
LARVE
LONGEVIDAD
LONGEVITE
LUTTE ANTIRAVAGEUR
Medically important nuisances and vectors, pests of stored products and materials: population survey and control
MUDA
MUE
NINFAS
Nymph
NYMPHE
PIRETRINAS SINTETICAS
PYRETHRINE DE SYNTHESE
Pyridines
SUPERVIVENCIA
SURVIE
Tick Control
Ticks
Vectors. Intermediate hosts
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Summary:Newly engorged larvae and nymphs of the lone star tick, Amblyomma americanum (L.), were exposed to 9 treatments of pyriproxyfen in glass vials consisting of dosages of 4, 8, and 16 micrograms/cm2 for 7 d, 14 d, and continuous exposure periods at each concentration. Treatment of newly engorged larvae resulted in decreased molting, altered postmolt defecation, and nymphal survival with results being dose and exposure dependent. Molting inhibition ranged from 35.9 to 68.4%. Successfully molted nymphs were lethargic, exhibited altered defecation patterns, and were short-lived compared with untreated adults. By 65 d after treatment, cumulative inhibition of molting and hastened mortality of molted adults resulted in 82.6-100% control, depending on dosage and exposure. Treatment of newly engorged nymphs showed minimal to no effect on molting; however, adults were lethargic and displayed altered postmolt defecation patterns. Subsequent adult longevity was most dramatically affected with 87.9-100% control achieved by 82-84 d after treatment. Fecal patterns and survivorship were dose and exposure dependent. Estimates of subsequent feeding success of adults treated as engorged nymphs, show reduced capacities of attachment, engorgement and reproduction
ISSN:0022-2585
1938-2928
DOI:10.1093/jmedent/34.2.206