Abstract
The insecticidal efficacy and repellant activity of lemon grass ( Cymbopogon citratus ) extracts were investigated within laboratory conditions of 28±2°C and 72±5% temperature and relative humidity respectively, against maize weevil Sitophilus zeamais . The results showed that both methanol and ethanol extracts of C. citratus have no contact toxicity against adult S. zeamais . At the highest concentrations (25.00%) of the extracts used, none of the S. zeamais died after 7 days of post treatments. The percentage damages on the treated seeds of maize also revealed that the percentage damages done on the treated seeds decreases as the concentration of the extracts used increases. The highest and lowest percentage damages of 17.17% and 0.67% were observed in the untreated control grains and grains treated with 25.00% concentration of methanol extract. The same pattern was observed in the ethanol extract treated grains; only with slight increases in the percentage damages of the untreated control grains and grains treated with 25.00% concentration of ethanol extract. The repellant activity of the extracts showed that at 10% concentration and above, produced 100% repellant effect on S. zeamais in both methanol and ethanol extracts. C. citratus extracts is a good repellant with less contact toxicity on S. zeamais .
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
