Extracts of selected flowering plants, which are considered eco-friendly, are usedfor the treatment of numerous ailments and vector control worldwide. This has resulted inapproximately 25 per cent of currently used drugs being derived from herbal sources. Theaqueous and methanolic extracts of twelve plant species, Psidium guajava (pink fruit),Psidium guajava (white fruit), Psidium cattleianum var. cattleianum, Psidium guineenseand Psidium X durbanensis, Achyranthes aspera, Alternanthera sessilis, Guilleminea densa,Capparis tomentosa, Leonotis leonurus, Dichrostachys cinerea and Carpobrotus dimidiatus,were tested for insecticidal activity, including larvicidal, adulticidal and repellent activities against the adult female mosquito, Anopheles arabiensis. The extracts of P. guajava (whitefruit), C. tomentosa, L. leonurus,D. cinerea, and C. dimidiatus exerted a pronounced inhibitoryeffect on adult insects, while those of P. guajava (pink fruit), P. X durbanensis, P. cattleianumvar. cattleianum, P. guineense, A. aspera, A. sessilis, and G. densa were ineffective andfailed to satisfy the criteria set by the World Health Organization. In the tests for repellencyagainst An. arabiensis, all the tested aqueous and methanolic plant extracts except those ofA. sessilis repelled 80-100% of mosquitoes. The most effective mosquito repellents were themethanol and aqueous extracts of P. guajava (pink fruit), P. X durbanensis, P. cattleianumvar. cattleianum, P. guineense, G. densa,L. leonurus and D. cinerea, which are potential sources of cost effective mosquito repellents to be utilized in malarial endemic areas.