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Chilean Journal of Agricultural Research
Instituto de Investigaciones Agropecuarias, INIA
ISSN: 0718-5820
EISSN: 0718-5839
Vol. 72, No. 2, 2012, pp. 195-200
Bioline Code: cj12031
Full paper language: English
Document type: Research Article
Document available free of charge

Chilean Journal of Agricultural Research, Vol. 72, No. 2, 2012, pp. 195-200

 en INSECTICIDAL EFFECT OF FRUIT EXTRACTS FROM Xylopia aethiopica check for this species in other resources AND Dennettia tripetala check for this species in other resources (ANNONACEAE) AGAINST Sitophilus oryzae check for this species in other resources (COLEOPTERA: CURCULIONIDAE)
Ukeh, Donald A.; Oku, Ene E.; Udo, Idorenyin A.; Nta, Abo I. & Ukeh, Jude A.

Abstract

The insecticidal and repellent activities of fruit extracts of Xylopia aethiopica check for this species in other resources (Dunal) A. Rich. and Dennettia tripetala check for this species in other resources (Baker f.) G.E. Schatz belonging to the family Annonaceae was studied against Sitophilus oryzae check for this species in other resources (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 F1 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 μL 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.

Keywords
Essential oils, powders, repellence, toxicity, Y-Tube olfactometer

 
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