title: Acaricidal activity of leaf extracts of Dalbergia sissoo Roxb. (Fabaceae) against synthetic pyrethroid resistant Rhipicephalus (Boophilus) microplus.
abstract: Resistance status of Rhipicephalus (Boophilus) microplus against synthetic pyrethroids was assessed by larval packet test which revealed level I and II resistance against cypermethrin and deltamethrin, respectively. Adult immersion test was employed to study the acaricidal activity of leaf extracts of Dalbergia sissoo (sheesham) against these ticks. Mortality and fecundity of ticks exposed to sheesham leaf aqueous (SLA) and ethanolic (SLE) extracts were evaluated at concentrations of 0.625, 1.25, 2.5, 5.0 and 10.0% and controls (distilled water and 10% ethanol). Higher acaricidal activity was recorded in SLA with a lower LC50 (95% CL) value of 1.58% (0.92-2.71%) than SLE [5.25% (4.91-5.63%)]. A significant decrease in egg mass weight and reproductive index was recorded in treated ticks along with an increase in percent inhibition of oviposition. A complete inhibition of hatching was recorded in eggs laid by ticks treated with higher concentrations of SLA, whereas, SLE exhibited no effect on hatching percentage.
authors.affiliation: Department of Veterinary Parasitology, College of Veterinary Science, Guru Angad Dev Veterinary and Animal Sciences University, Ludhiana - 141004, India. Electronic address: nirbhayksingh@yahoo.co.in.
authors.forename: Nirbhay Kumar
authors.initials: NK
authors.lastname: Singh
authors.affiliation: Department of Veterinary Parasitology, College of Veterinary Science, Guru Angad Dev Veterinary and Animal Sciences University, Ludhiana - 141004, India.
authors.lastname: Jyoti
authors.affiliation: Department of Veterinary Pharmacology & Toxicology, College of Veterinary Science, Guru Angad Dev Veterinary and Animal Sciences University, Ludhiana - 141004, India.
authors.forename: Bhaskar
authors.initials: B
authors.lastname: Vemu
authors.affiliation: Department of Veterinary Parasitology, College of Veterinary Science, Guru Angad Dev Veterinary and Animal Sciences University, Ludhiana - 141004, India.
authors.forename: Mranalini
authors.initials: M
authors.lastname: Prerna
authors.affiliation: Department of Veterinary Parasitology, College of Veterinary Science, Guru Angad Dev Veterinary and Animal Sciences University, Ludhiana - 141004, India.
authors.forename: Harkirat
authors.initials: H
authors.lastname: Singh
authors.affiliation: Department of Veterinary Pharmacology & Toxicology, College of Veterinary Science, Guru Angad Dev Veterinary and Animal Sciences University, Ludhiana - 141004, India.
authors.forename: V K
authors.initials: VK
authors.lastname: Dumka
authors.affiliation: Department of Veterinary Pharmacology & Toxicology, College of Veterinary Science, Guru Angad Dev Veterinary and Animal Sciences University, Ludhiana - 141004, India.
authors.forename: S K
authors.initials: SK
authors.lastname: Sharma
mesh_terms: D056810:Acaricides; D000818:Animals; D035782:Dalbergia / Q000737:chemistry*; D004351:Drug Resistance; D005260:Female; D007814:Larva; D010936:Plant Extracts; D018515:Plant Leaves / Q000737:chemistry; D011722:Pyrethrins / Q000494:pharmacology; D048494:Rhipicephalus / Q000254:growth & development
chemical_list: D056810:Acaricides; D010936:Plant Extracts; D011722:Pyrethrins
keywords: Acaricidal activity; Dalbergia sissoo; Rhipicephalus (Boophilus) microplus; Synthetic pyrethroid resistance