Effect of 25-azacholestane on Argas (Argas) hermanni (Ixodoidea: Argasidae)

Unfed and fed nymphal Argas hermanni Audouin were treated topically with 1, 5, 10, 15, and 20 micrograms of 25-azacholestane. The azasteroid did not inhibit feeding but had a dose-related lethal effect on unfed nymphs. Generally, it had little effect on nymphs treated after feeding. The 10-microgram...

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Bibliographic Details
Published in:Journal of medical entomology 1996-09, Vol.33 (5), p.783-789
Main Authors: Khalil, G.M. (U.S. Naval Medical Research Unit.), Marzouk, A.S, Mohamed, F.S.A, Darwish, Z.E.A
Format: Article
Language:English
Subjects:
Acari
ACARICIDAS
ACARICIDE
ACCION DE LOS PLAGUICIDAS
ACTION DES PESTICIDES
Animals
Antibacterial agents
Antibiotics. Antiinfectious agents. Antiparasitic agents
APLICACION LOCAL
APPLICATION LOCALE
ARGAS
Argasidae
Azasteroids
Biological and medical sciences
Columbidae
CONTROL DE PLAGAS
DESARROLLO BIOLOGICO
DEVELOPPEMENT BIOLOGIQUE
ESTADO NUTRICIONAL
ESTEROIDES
ETAT NUTRITIONNEL
Female
FERTILIDAD
FERTILITE
Fertility
Longevity
LUTTE ANTIRAVAGEUR
Male
Medical sciences
Molting
NINFAS
NYMPHE
OVIPOSICION
Oviposition
Pharmacology. Drug treatments
PONTE
PROPORCION DE LOS SEXOS
SEX RATIO
STEROIDE
Ticks
TOXICIDAD
TOXICITE
VIABILIDAD
VIABILITE
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Summary:Unfed and fed nymphal Argas hermanni Audouin were treated topically with 1, 5, 10, 15, and 20 micrograms of 25-azacholestane. The azasteroid did not inhibit feeding but had a dose-related lethal effect on unfed nymphs. Generally, it had little effect on nymphs treated after feeding. The 10-microgram dose reduced the premolting period of nymphs treated before feeding. Some adults emerging from the 5- to 20-microgram dosage groups that had been treated before feeding failed to shed their exuvia and others also had deformed legs. Greater numbers of adult females emerged from nymphs treated before feeding. The preoviposition period was almost the same in control females and of female mates, with males emerging from treated nymphs. Females from nymphs treated before feeding have a prolonged preoviposition period. Fecundity was reduced when males were treated with 10-20 micrograms as unfed nymphs. Egg hatch was reduced for females treated with 15 and 20 micrograms as fed nymphs, females treated with 5 and 10 micrograms unfed nymphs, and as progeny of males treated with 10 micrograms as unfed nymphs. Results suggest possible interference with juvenile hormone titer in treated ticks
ISSN:0022-2585
1938-2928
DOI:10.1093/jmedent/33.5.783