BIOASSAY OF NEW CHEMISTRY INSECTICIDES AND BOTANICALS AGAINST TOBACCO CATERPILLAR, Spodoptera litura(Fabricius) ON CAPSICUM
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Date
2014
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
UHF,NAUNI
Abstract
ABSTRACT
Intrinsic toxicity of insecticides namely fipronil, flubendiamide, chlorfenapyr, deltamethrin
and indoxacarb was studied against 3
rd
instar larvae of tobacco caterpillar, Spodoptera litura
(Fabricius) in the laboratory of the Department of Entomology, Dr. Y. S. Parmar University of
Horticulture and Forestry, Nauni, Solan (HP). Amongchemical insecticides, indoxacarb was the most
toxic against the test insect with LC50
value of 0.0011 (fiducial limits: 0.0009 and 0.0014) followed by
fipronil (0.0014 %) (fiducial limits: 0.0012 and 0.0017), chlorfenapyr (0.0024 %) (fiducial limits:
0.0019 and 0.0031), flubendiamide (0.0038 %) (fiducial limits: 0.0028 and 0.0050) and deltamethrin
(0.0055 %) (fiducial limits: 0.0043 and 0.0069) percent. The respective LC
90values obtained were
0.0067 (fiducial limits: 0.0036 and 0.0124), 0.0053 (fiducial limits: 0.0037 and 0.0076), 0.0151
(fiducial limits: 0.0084 and 0.0269), 0.0272 (fiducial limits: 0.0134 and 0.0553) and 0.0336 (fiducial
limits: 0.0202 and 0.0558) per cent. In case of botanicals, aqueous extracts of neem seed kernels and
darek drupes resulted in dosage-dependent mortalityof eggs of S. liturawith LC50values of 4.0703
(fiducial limits: 3.2831 and 5.0464) and 4.4454 (fiducial limits: 3.7257 and 5.3041), and LC
90values
of 35.7757 (fiducial limits: 19.9433 and 64.1770) and 29.1018 (fiducial limits: 19.8862 and 42.5880)
per cent, respectively. Aqueous extracts of neem seed kernels and darek drupes exhibited strong
antifeedant action against 3
rd
instar larvae of S. litura as the caterpillar consumed only 21.6, 16.2,
11.4, 7.4 and 2.8 cm
2
and 21.8, 16.6, 13.8, 6.6 and 3.2 cm
2
leaf area when treated with 0.625, 1.25,
2.5, 5 and 10 and 1.25, 2.5, 5, 10 and 20 per cent concentrations of neem and darek extracts,
respectively, as against 46.0 and 48.8 cm
2
in control treatments, respectively. These extracts at 0.25
and 0.5 per cent each also reduced the weight of 4
th
and 6
th
instar larvae developed from larvae treated
during 3
rd
instar significantly over control.
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