Extracts of medicinal plants as entomocide against Sitotroga cerealella (Olivier) infestation on paddy rice
Department of Biology, School of Sciences, Federal University of Technology P.M.B 704, Akure, Nigeria
Medicinal Plant Research, 2014, Vol. 4, No. 9 doi: 10.5376/mpr.2014.04.0009
Received: 10 Sep., 2014 Accepted: 21 Oct., 2014 Published: 20 Nov., 2014
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Preferred citation for this article:
Ashamo and Ogungbite, 2014, Extracts of medicinal plants as entomocide against Sitotroga cerealella (Olivier) infestation on paddy rice, Medicinal Plant Research, 2014, Vol.4, No.9 1-7 (doi: 10.5376/mpr.2014.04.0009)
Studies on the efficacy of extracts from some plants as entomocides against Sitotroga cerealella (Olivier) infestation on paddy rice were carried out in the laboratory at ambient temperature of 28±2oC and relative humidity of 75±5%. Ethanolic, acetone and water extracts of seeds from Aframomum melegueta K. Schumn, Eugenia aromatica L. Merril and Perry, Piper guineense Schum and Thonnand Xylopia aethiopica Dunal A. The plant materials were tested against 0-24hr old eggs of S. cerealella in paddy rice at different concentrations. Results showed that all the extracts have significant effect on the adult emergence, developmental period and longevity of the adult moth. There was no adult emergence at 4 and 6% concentrations of ethanol and acetone extracts of the plants tested. Highest adult emergence of 36.6 was obtained from the control which was significantly different (p<0.05) from others. There were some adult emergence (5.27 to 7.67) in water extracts of the plants but significantly lower than in the control. The ethanolic extract of the plants showed the greatest efficacy as they were able to prevent emergence of the adult moth at all concentrations. The efficacy of the plants could be arranged in this order ethanol extract>acetone extract>water extracts. Water absorption capacity of treated seeds was not adversely affected when compared with control but the values were higher in ethanol extracts than others.
Entomocides; Sitotroga cerealella; Adult emergence; Life span; Water absorption capacity