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The present study was carried out to establish the properties of Bougainvillea glabra leaf extract
and chitin synthesis inhibitor, flufenoxuron on larvicidal and pupicidal activity against the paddy
army worm, Spodoptera mauritia. The methanol extract of B. glabra leaves showed larvicidal and
pupicidal activity, after 24 h of exposure; against third- to sixth- instar larvae and pupae of S.
mauritia, with obtained values of LD50=5.340% in 3rd instar, 9.730 % in 4th instar,14.891% in 5th
instar and 18.755 % in 6th and 21.468% in pupae respectively. The effect of chitin synthesis inhibitor,
flufenoxuron againstthe third to sixth instar larvae and pupae with LD50 values in 3rd instar 2.088 %,
4th instar was 2.978 %, 5th instar was .4.37 %, and 6th instar was 5.946%, and pupae was .8.032 %,
respectively. Moreover, combined treatment of the B. glabra and flufenoxuron LD50 values of 3rd
instar was 0.638 %,4th instar was 1.571%, 5th instar was 2.475 %, and 6th instar was 4.768 %, and
pupae was 8.266 %, respectively. The results showed the leaves extract of B. glabra and insect
growth regulator, flufenoxuron are best choice for controlling Spodoptera mauritia. Hence, B.
glabra and flufenoxuron can be considered for eco-friendly pest control programs.
Key words: Bougainvillea glabra, Spodoptera mauritia, larvicidal, pupicidal.