Formerly International Journal of Basic and Applied Agricultural Research

Fumigant toxicity of some essential oils and their combinations against Rhyzopertha dominica (Fabricius) and Sitophilus oryzae (Linnaeus)

NIDHI TEWARI and S. N. TIWARI
Pantnagar Journal of Research, Volume - 19, Issue - 3 ( September-December, 2021)

Published: 2021-12-31

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Abstract


Experiments were conducted to study the fumigant toxicity of essential oils of mint (Mentha arvensis), peppermint (Mentha piperita), spearmint (Mentha spicata), citronella (Cymbopogon winterianus), Nilgiri (Eucalyptus citriodora), eucalyptus (Eucalyptus globulus), and pine (Pinus roxburghii ) and their combinations against Lesser grain borer, Rhyzopertha dominica (Fabricius) (Coleoptera: Bostrichidae) and Rice weevil, Sitophilus oryzae (Linnaeus) (Coleoptera : Curculionidae). All the oils except Nilgiri and eucalyptus oils were highly effective against both the insects at 0.2 per cent (v/w) as they suppressed 90-100 per cent progeny of test insects. Increase in concentration of essential oil to 0.4 per cent enhanced their fumigant toxicity; however, Nilgiri oil remained less effective against both the insects even at this level while eucalyptus oil became moderately and highly effective against R. dominica and S. oryzae, respectively. All the two, three, four, five, six and seven essential oils combinations were highly effective against both the insects at 0.20, 0.13, 0.10, 0.08, 0.07 and 0.06 per cent each, respectively, except mint + eucalyptus which was less effective against R. dominica and citronella + Nilgiri, citronella + eucalyptus, Nilgiri + eucalyptus and peppermint + Nilgiri + eucalyptus oils which showed slightly less efficacy against S. oryzae. The mixture of peppermint + eucalyptus, peppermint + pine and eucalyptus + pine at 0.1+0.1 per cent completely checked the progeny production of both the insects.


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