Efficacy of Some Medicinal Plants against Rice Weevil, Sitophilus Oryzae L. and Red Flour Beetle Tribolium Castaneum (HERBST)
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Abstract
Objective: Plant extracts are safe and alternate methods for the control of stored product pests. The present study was conducted to evaluate the mortality and repellency effect of three medicinal plants viz. peppermint (Mentha piperita), sage (Salvia officinalis) and feverfew (Tanacetum parthenium) against Rice weevil, Sitophilus oryzae L. and Red flour beetle, Tribolium castaneum (Herbst).
Methodology: Fresh leaves of all plants were chopped into small pieces and dried in the shade at room temperature. The dried leaves were minced into fine powder with an electric blender. The dry powder of each plant sample (10g) was soaked in 100 mL of methanol and placed on an electric shaker for 24 hours. The extract was filtered using filter paper and concentrated in a rotary evaporator.
Results: The results indicated that all of the medicinal plant extracts had repellent and fatal effects against the insect as compared to the control. Among the three different plant extracts, Mentha piperita proved as the most effective treatment showing maximum mortality of 35.48% in Tribolium castaneum and 38.33% in Sitophilus oryzae. The present study also revealed that all the tested plant extracts significantly repelled the insects. Tanacetum parthenium exhibited high repellency of 4.52% and 5.95 % against Tribolium castaneum and Sitophilus oryzae respectively, while no repellency was observed in the control treatment.
Conclusion: It is concluded that the application of these medicinal plants may be promising in protecting the stored products against insect pests without hazardous effects.
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