%0 Journal Article
%T Insecticidal Effect of Fruit Extracts from Xylopia aethiopica and Dennettia tripetala (Annonaceae) against Sitophilus oryzae (Coleoptera: Curculionidae) Efecto Insecticida de Extractos de Fruta de Xylopia aethiopica y Dennettia tripetala (Annonaceae) contra Sitophilus oryzae (Coleoptera: Curculionidae)
%A Donald A . Ukeh
%A Ene E Oku
%A Idorenyin A Udo
%A Abo I Nta
%J Chilean Journal of Agricultural Research
%D 2012
%I 
%X The insecticidal and repellent activities of fruit extracts of Xylopia aethiopica (Dunal) A. Rich. and Dennettia tripetala (Baker f.) G.E. Schatz belonging to the family Annonaceae was studied against Sitophilus oryzae (L.), an economic, primary post-harvest pest of rice, and other cereal products. Infested rice grains (100 g) treated with 1, 2, 3, 4, and 5% (w/w) powders of both plants were evaluated for toxicity against S. oryzae every 24 h for 3 d, and during Fi progeny emergence. The essential oils of both plants were also applied at 0.5, 1, 1.5 and 2 mg cm-2 filter paper in Petri dishes for toxicity bioassays at 24 h exposure. Repellence bioassay with 10 米L solution of essential oils on filter paper was performed in a Y-Tube airflow olfactometer. Results indicate that powders of both plants significantly (P < 0.001) caused adult weevil mortality and a reduction in F1 progeny emergence than the control. Essential oils were also significantly (P < 0.001) adulticidal to S. oryzae after 24 h with the highest dose (2 mg cm-2) producing 100% mortality respectively. Similarly, both male and female weevils significantly avoided the test arm compared to the control arm in the Y-Tube olfactometer repellence tests. These results suggest that X. aethiopica and D. tripetala natural extracts have potential for use as part of integrated pest management of stored product protection against S. oryzae. La actividad insecticida y repelente de los extractos frutales de Xylopia aethiopica (Dunal) A. Rich. y Dennettia tripetala (Baker f.) G.E. Schatz pertenecientes a la familia Annonaceae fueron evaluados contra Sitophilus oryzae (L.), plaga primaria de importancia econ車mica en poscosecha de arroz y otros cereales. Granos de arroz (100 g) infestados tratados con polvos de ambas plantas al 1, 2, 3, 4, y 5% (p/p) fueron evaluados para la toxicidad contra S. oryzae cada 24 h por 3 d y durante la emergencia de la progenie F1. Los aceites esenciales de ambas plantas tambi谷n fueron aplicados en papel filtro a 0,5; 1; 1,5 y 2 mg cm-2 en cajas de Petri para bioensayos de toxicidad con exposici車n de 24 h. Bioensayos de repelencia con 10 米L de soluci車n de los aceites esenciales impregnados en papel filtro fueron realizados en un olfat車metro de flujo de aire Y-Tube. Los resultados indican que los polvos de ambas plantas causan una mortalidad significativa de estos insectos (P < 0,001) y una reducci車n en la emergencia de la progenie F1 con relaci車n al control. Los aceites esenciales tambi谷n mostraron un efecto adulticida significativo (P < 0,001) despu谷s de 24 h con la dosis m芍s al
%K aceites esenciales
%K polvos
%K repelencia
%K toxicidad
%K olfat車metro Y-Tube
%K Essential oils
%K powders
%K repellence
%K toxicity
%K Y-Tube olfactometer
%U http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000200005