Efficacy of botanical extracts from Callitris glaucophylla against Aedes aegypti and Culex annulirostris mosquitoes

Shaalan, Essam Abdel-Salam, Canyon, Deon Vahid, Bowden, Bruce, Younes, Mohamed Wagdy Faried, Abdel-Wahab, Hoda, and Mansour, Abdel-Hamid (2006) Efficacy of botanical extracts from Callitris glaucophylla against Aedes aegypti and Culex annulirostris mosquitoes. Tropical Biomedicine, 23 (2). pp. 180-185.

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Abstract

Using standard WHO methodology, this study investigated the susceptibility of 4(th) instar Aedes aegypti (L) and Culex annulirostris (Skuse) larvae to three extracts from Callitris glaucophylla (J. Thompson & L. Johnson) (1: steam distillation extract, 2: liquefied refrigerant gas extract, and 3: methanol reflux extract), lambda-cyhalothrin (a synthetic pyrethroid insecticide) and fenitrothion (an organophosphorous insecticide). Cx. annulirostris was significantly more susceptible than Ae. aegypti to all tested chemicals except lambda-cyhalothrin. Responses to the three C. glaucophylla extracts were exceptional for a botanical compound: Cx. annulirostris (LC(50) = 0.23, 9.53 and 38.95 mg/L) and Ae. aegypti (LC(50) = 0.69, 5.21 and 306.43 mg/L). Both Cx. annulirostris and Ae. aegypti larvae were significantly more susceptible to lambda-cyhalothrin (LC(50) = 0.00013 and 0.00016 mg/L) than fenitrothion (LC(50) = 0.0009 and 0.004 mg/L). As expected, the pyrethroid and organophosphorous insecticides were far more potent than the crude C. glaucophylla extracts. The steam distilled extract was fractionated and the major components guaiol and citronellic acid were identified and tested. Activities for these major components were lower than observed for the distillate. Minor components include lactones such as eldanolide, and future testing of minor components may indicate the active component.

Item ID: 4066
Item Type: Article (Refereed Research - C1)
Keywords: mosquito transmission; Callitris glaucophylla; Aedes aegypti; Culex annulirostris
Additional Information:

Reproduced with permission from Malaysian Society of Parasitology and Tropical Medicine.

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ISSN: 0127-5720
Date Deposited: 27 Oct 2009 03:39
FoR Codes: 11 MEDICAL AND HEALTH SCIENCES > 1199 Other Medical and Health Sciences > 119999 Medical and Health Sciences not elsewhere classified @ 100%
SEO Codes: 92 HEALTH > 9204 Public Health (excl. Specific Population Health) > 920404 Disease Distribution and Transmission (incl. Surveillance and Response) @ 67%
92 HEALTH > 9204 Public Health (excl. Specific Population Health) > 920412 Preventive Medicine @ 33%
Citation Count from Scopus Scopus 10
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