Faculty of Biology, University of Latvia
Hard copy: ISSN 1691–8088
On-line: ISSN 2255–9582
Environ Exp Biol (2020) 18: 283–289
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Environmental and

Environ Exp Biol (2020) 18: 283–289

Orginal Paper

Efficacy of different extracts of Allium chinense bulb against Sitotroga cerealella infestation in stored paddy grain, Oryza sativa

Thejanuo Rhetso1, M.S. Roopa1, Abraham Verghese2, R. Shubharani1, V. Sivaram1*
1 Department of Botany, Bangalore University, Bengaluru 560056, Karnataka, India
2 ICAR-National Bureau of Agricultural Insect Resources, Bengaluru 560024, Karnataka, India
* Corresponding author, E-mail: sivaram900@gmail.com


Stored grain pest Sitotroga cerealella (Olivier) (Lepidoptera: Gelechiidae) is considered as one of the most destructive pests of cereal grains. The study aim was to develop methods to suppress moth emergence and reduce the weight loss of paddy grain (Oryza sativa L.) in storage using bulb extracts of Allium chinense G.Don from solvents of varying polarity (hexane, petroleum ether, chloroform, methanol, ethanol, and water). The results showed that all of the tested extracts had significant effect on the developmental period and moth emergence. The petroleum ether extract with LC50 value of 0.39% (0.16 to 0.62%) and ethanol extract with LC50 of 0.45% (0.21 to 0.68%) exhibited remarkable activity against S. cerealella, as no moth emergence was observed when applied at 2% concentration. For the chloroform extract, 2% concentration showed the highest inhibition on the developmental stage, where moths emerged at 42.50 days, compared to 28.75 days in the control. The weight loss of paddy was best controlled with 2% ethanol extract (2.55%); the highest loss was recorded in paddy treated with water extract. The present study concludes that petroleum ether and ethanol extract of bulbs of A. chinense have potential use in integrated pest management of S. cerealella for post-harvest protection of paddy, considering availability and easy propagation of the plant, and environmental friendliness.

Key words: Allium chinense, bulb extract, mortality, paddy (Oryza sativa), Sitotroga cerealella.

Environ Exp Biol (2020) 18: 283–289
 DOI: http://doi.org/10.22364/eeb.18.27

Prof. Gederts Ievinsh
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