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VOL. 9, ISSUE 8 (2024)
Larvicidal and antifeedant properties of certain plant extracts against Helicoverpa armigera larvae (Hubner)
Authors
V Arunagiri, G Sundararajan
Abstract
For this study, we selected a few plants among the larvicidal species
under research, including Mikania micarantha, Andrographis paniculata Ness.,
Eupatorium riparium, Datura metal L., Catharanthus roseus L (G) Don., Cassia
tora L., and Cardiospermum halicacabum L. Characteristics and repressive
actions on Helicoverpa armigera (Hubner) larvae in culture. All of the
chosen plants' crude extracts revealed growth that was dependent on biology.
Better bioactivity (p < 0.05) was demonstrated by A. paniculata, Cassia
tora L., C. halicacabum L., and Datura metal L. compared to
the extract and control of C. roseus, E. riparian, and M. micarantha.
The mortality of the A. paniculata methanol extract varied from 29.00%
to 58.22% at test dosages of 0.2%, 0.4%, and 1% w/v, while that of the C.
tora L. extract was lower. The highest percentage of larval food reduction
was seen in 76.61%, 0.2%, and 0.4% of cases, respectively. The crude extract of
C. halicacabum L. had the highest degree of food intolerance and oral
allergy, whereas the extract of D. metal had the highest level.
Therefore, it can be concluded that four of the selected plants are hazardous
and that further study of them is necessary to develop natural pesticides.
According to an ongoing study, several plants will be evaluated for their
larvicidal activity and capacity to keep hatchlings of Helicoverpa armigera
(Hubner) from feeding in a lab environment. Among the chosen plants is Andrographis
paniculata Ness. With an increase in crude extracts of all plants, the
bioactivity of Cassia tora L., Cardiospermum halicacabum L., Catharanthus
roseus L (G) Don., Eupatorium riparium, Mikania micarantha,
and Datura metal L. increased. However, there was a significant
difference (p 0.05) between the bioactivity of four plants (A. paniculata,
Cassia tora L., C. halicacabum L., and Datura metal L.) and
the control and output of C. roseus, E. riparium, and M.
micarantha. The most toxic A. paniculata methanol extract (0.2%,
0.4%, and 1% w/v) killed 29.00% to 58.22% of the moths in the tests that were
examined. Nevertheless, the creation of C. tora L. The diet was the
biggest barrier, resulting in a 0.2 and 0.4 percent decrease in feed
consumption in 59.92% and 76.61% of cases, respectively. The whole leaf of C.
halicacabum L. showed significant oral allergy and preventative treatment,
but the D. metal extract only showed modest oral allergy and protection
against depression throughout maintenance. Therefore, we may conclude that four
of the selected plants have insects and that more research is necessary to
produce healthier harvests.
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Pages:96-101
How to cite this article:
V Arunagiri, G Sundararajan "Larvicidal and antifeedant properties of certain plant extracts against <i>Helicoverpa armigera</i> larvae (Hubner)". International Journal of Entomology Research, Vol 9, Issue 8, 2024, Pages 96-101
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