Evaluation of larvicidal efficacy of indigenous plant extracts against Culex quinquefasciatus (Say) under laboratory conditions

Authors : Javaid IQBAL, Faisal ISHTIAQ, Abdulaziz S ALQARNI, Ayman A OWAYSS

Pages : 207-215

View : 17 | Download : 9

Publication Date : 2018-06-01

Article Type : Research Paper

Abstract :The present study focused on the insecticidal potential of easily available local botanicals using a simple but effective method. Seven indigenous plants insert ignore into journalissuearticles values(Cinnamomum tamala insert ignore into journalissuearticles values(taiz pat);, Aloe vera insert ignore into journalissuearticles values(aloe vera);, Datura alba insert ignore into journalissuearticles values(datura);, Allium sativum insert ignore into journalissuearticles values(garlic);, Allium cepa insert ignore into journalissuearticles values(onion);, Zingiber officinale insert ignore into journalissuearticles values(ginger);, and Ocimum basilicum insert ignore into journalissuearticles values(niazbo/basil); were tested for their larvicidal efficacy against Culex quinquefasciatus insert ignore into journalissuearticles values(Say); under laboratory conditions. The evaluation of a series of five concentrations insert ignore into journalissuearticles values(1%, 2%, 3%, 4%, and 5%); of aqueous plant extracts against the 4th instar larvae revealed convincing larval mortality effects at 24 and 48 h after exposure. Larval mortality showed a significant concentration-dependent correlation. No mortality was observed in the control. The LC50 values demonstrated garlic as the most effective insert ignore into journalissuearticles values(1.37%);, followed by taiz pat insert ignore into journalissuearticles values(1.48%); and aloe vera insert ignore into journalissuearticles values(1.96%);, at 24 h. Moreover, the LC50 at 48 h showed high efficiency by aloe vera insert ignore into journalissuearticles values(0.37%);, followed by garlic insert ignore into journalissuearticles values(0.55%); and taiz pat insert ignore into journalissuearticles values(0.98%);. The sequence of LC50 values for the other plants were onion insert ignore into journalissuearticles values(2.20%); < datura insert ignore into journalissuearticles values(2.49%); < niazbo insert ignore into journalissuearticles values(5.32%); < ginger insert ignore into journalissuearticles values(7.48%); after 24 h and datura insert ignore into journalissuearticles values(1.13%); < niazbo insert ignore into journalissuearticles values(1.17%); < onion insert ignore into journalissuearticles values(1.24%); < ginger insert ignore into journalissuearticles values(2.43%); after 48 h. Taken together, the aqueous extracts of all plants exhibited potential efficacy against C. quinquefasciatus larvae and could be considered as potent natural larvicidal agents. These plants may be recommended for use in mosquito management programs as potential alternatives to synthetic insecticides. The simple aqueous extraction method is easy and inexpensive and can be used at the home level for mosquito management.
Keywords : Aqueous extracts, botanicals, larvicidal activity, mosquito