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VOL. 8, ISSUE 12 (2023)
Assessment of biocontrol competence of some medicinal leaves against Sitophilus oryzae L. using residual film method
Authors
Manas Paramanik
Abstract
Quantitative and qualitative loss of stored grains and their products
by different pests is a major problem in India and other countries. As
synthetic pesticides impose several environmental and health repercussions, botanical
products may be used effectively to reduce the loss. The efficacy of leaf
extracts of four plants, namely Azadirachta indica, Ocimum
tenuiflorum, Justicia adhatoda,
and Centella asiatica, was assessed against Sitophilus oryzae by
using the residual film method. Results depict 73.33% and 66.67% mortality of
the rice weevils with O. tenuiflorum and A. indica, respectively,
in a 3 mg/cm2 concentration, within 72 hours. The calculated LC50
values in 72 hours of exposure for A. indica, O. tenuiflorum, J. adhatoda, and C.
asiatica leaf extracts were 1.50, 1.49, 5.76, and 6.22 mg/cm2, respectively.
Bioassay with mixed extracts gives even better results, with LC50
values as low as 0.86 mg/cm2 in 72 hours of exposure. This could be
a simple, cost-effective option against stored grain pests. These leaf products
have Ayurvedic properties and should be safe to mix with food grains without
adverse effects.
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Pages:48-51
How to cite this article:
Manas Paramanik "Assessment of biocontrol competence of some medicinal leaves against <i>Sitophilus oryzae</i> L. using residual film method". International Journal of Entomology Research, Vol 8, Issue 12, 2023, Pages 48-51
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