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VOL. 8, ISSUE 12 (2023)
Evaluation of larvicidal activity and interaction effects of brown seaweed, Turbinaria ornata (Turner) J Agardh with Neem and Pungam Leaf Extracts Against Cnephalocorcis medinalis (Guenee) (Lepidoptera: Crambidae)
Authors
Sowmiya K, Kannan R
Abstract
The study investigates the larvicidal potential of Turbinaria ornata,
neem, and pungam leaf extracts against Cnephalocorcis medinalis larvae.
The study focused on determining the lethal concentration and interactions
between the extracts, under a Completely Randomized Design with a no-choice
leaf dip method at the Department of Entomology, Faculty of Agriculture,
Annamalai University, in laboratory conditions with three replications per
treatment. In preliminary screening, it was observed that all extracts caused
100% mortality at maximum concentrations, while untreated controls showed no
mortality. Probit analysis was used to determine the LC20 and LC25
doses for T. ornata, which were found to be 2.52% and 3.01%,
respectively. Meanwhile, neem and pungam leaf extracts showed LC5,
LC15, and LC25 concentrations of 0.4%, 0.7%, and 1%, and
1%, 1.5%, and 2%, respectively. To test the binary mixtures (1:1), twelve
combinations were tested by combining LC20 and LC25 doses
of T. ornata with LC5, LC15, and LC25 doses
of NLE and PLE. Among the binary mixtures tested, T.o (3%) + NLE (1%)
exhibited the highest mortality (60.00%) with a pupa-to-adult conversion ratio
of 1:0.71, indicating an additive effect. While antagonistic interaction was
observed in T.o (2.5%) + PLE (1%) with co-toxicity factor of -24.98.
Overall, the study highlights the potential of using these natural extracts as
potential agents in integrated pest management strategies against C.
medinalis larvae.
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Pages:72-76
How to cite this article:
Sowmiya K, Kannan R "Evaluation of larvicidal activity and interaction effects of brown seaweed, <i>Turbinaria ornata </i>(Turner) J Agardh with Neem and Pungam Leaf Extracts Against <i>Cnephalocorcis medinalis </i>(Guenee) (Lepidoptera: Crambidae)". International Journal of Entomology Research, Vol 8, Issue 12, 2023, Pages 72-76
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