author(s)
Sudarshana Mahanta, Bulbuli Khanikor and Riju Sarma

abstract
The present investigation was made for assessing the larvicidal, ovicidal, adulticidal and repellent effect of essential oil from the peel and leaves of Citrus grandis against Culex quinquefasciatus. The results revealed that the oil was the most effective as ovicides having LC₅₀ value14.02 ppm in case of essential oil of leaves and 17.06ppm in case of that of peel at 72 hour followed by larvicidal activity with LC₅₀ value 18.53ppm and 40.59ppm at 72 hour respectively. But there was not much adulticidal affect recorded though it gave good protection time against C. quinquefasciatus. Thus, it is a potential repellent, ovicidal as well as larvicidal agent for the control of C. quinquefasciatus. One of the most important detoxifying enzyme i.e. glutathione-s-transferase level was found to decrease after applying the LC₅₀ dose treated larvae and adults than the non-treated control groups