Abstract:
The toxicity and repellency of methanolic extracts (ME) of four plant species namely Lantana camara, Ruta chalepensis, Rhazya stricta and Heliotropium bacciferum against the red flour beetle Tribolium castaneum (Herbst) (Coleoptera: Tenebrionidae) were evaluated. ME of each plant was tested at different concentration (200, 300, 400 and 500 ppm) against the adult stage of T. castaneum. Mortality percentage of T. castaneum was recorded after 2, 4 and 6 days from ME exposure. ME of the different plant species showed significant and variable toxicities against the red flour beetles. Mortality percentage significantly increased with the increase of exposure period and concentration of ME. The highest mortality of T. castaneum adults was recorded with the use of ME of L. camara and R. chalepensis at 500 ppm. The toxic impact of ME from these two plants were reasonably more distinct with LC50 values of 200.99 and 240.25 ppm, for L. camara and R. chalepensis respectively, after 2 days of exposure, whereas their corresponding LC50 values after 6 days were 111.63 and 115.75, respectively. A similar effect was detected when the T. castaneum adults were treated for 6 days by ME of R. stricta and H. bacciferum showing lower LC50 values of 170.48 and 286.67 ppm, respectively. ME of L. camara and R. chalepensis at 500 ppm exhibited higher repellency 100% and 92.08%, respectively against T. castaneum adults. Overall, the application of natural plant extracts of both L. camara and R. chalepensis could be promising a prompt protection of stored grains against T. castaneum.
Page(s):
363-369
DOI:
DOI not available
Published:
Journal: Bioscience Research, Volume: 19, Issue: 1, Year: 2022
Keywords:
Tribolium castaneum
,
Tribolium castaneum
,
Rhazya stricta
,
Lantana camara
,
Ruta chalepensis
,
red flour beetle
,
Heliotropium bacciferum