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EVALUATION OF BIOCHEMICAL CHANGES IN Spodoptera litura Fab. AND/OR Plutella xylostella L. DUE TO TREATMENT OF PLANT PRODUCTS

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Title EVALUATION OF BIOCHEMICAL CHANGES IN Spodoptera litura Fab. AND/OR Plutella xylostella L. DUE TO TREATMENT OF PLANT PRODUCTS
 
Creator NARAHARI, K
 
Contributor SATYANARAYANA, J
 
Subject BIOCHEMICAL, CHANGES, Spodoptera, litura, Fab, TREATMENT, PLANT, PRODUCTS
 
Description Field and the laboratory investigations were carried out during 2007-2008 at
College of Agriculture, Rajendranagar, Hyderabad on Evaluation of Biochemical changes
in Spodoptera litura Fab. and/or Plutella xylostella L. due to treatment of plant products.
During the study, crude neem oil, NSKE, neem oil, jatropha leaf extract, pongamia
seed extract and acephate treated leaves and untreated leaves were fed to test insects
larvae of S.litura and P.xylostella. The biochemical contents (proteins, sugars and lipids)
in third instar larvae of S.litura after 24 h of feeding were estimated. Food consumption
and its utilization indices in S.litura were calculated at an interval of 24 h from third
instar to sixth instar larvae. Bio efficacy studies were also conducted with S.litura and
P.xylostella to know the efficacy of plant products. In addition morphological changes in
S.litura and P.xylostella occurring due to various plant product treatments were recorded.
The third instar larvae of S.litura reared on plant products treated leaves showed
the maximum reduction of proteins and sugars with neem oil (19.39 and 26.47 mg/g)
compared to control (29.72 and 32.22 mg/g), whereas, in case of lipids more reduction
was observed with NSKE (10.27 mg/g) compared to control (16.20 mg/g). Food consumption studies in S.litura larvae revealed that the larvae fed on neem
oil treated leaves recorded low food consumption, faecal matter production, mean larval
weight and weight gain which were significantly different from control. In all the
treatments, amount of food consumption increased from third instar to sixth instar larvae,
and there was a direct relation between faecal excretion and food intake. With respect to
consumption indices, the larvae reared on treated leaves had high CI (Consumption
index) and AD (Approximate digestibility) values, low GR (Growth rate), ECI
(Efficiency of conversion of ingested food) and ECD (Efficiency of conversion of
digested food) values, when compared to control with all the four instars (third to sixth).
In the bioefficacy studies, among the plant product treatments against second
instar larvae of S.litura and P.xylostella, neem oil caused maximum cumulative mortality
of 70.00 per cent in S.litura and 80.00 per cent in P. xylostella. All the treatments were
found to be significantly superior over the control.
With respect to morphological studies, not much colour variation was observed in
S. litura larvae reared on treated (crude neem oil, NSKE, neem oil, jatropha leaf extract,
pongamia seed extract and acephate) and untreated leaves. Abnormal pupae were
observed in neem oil and acephate treatments and no adult emergence was also recorded
in these treatments. Abnormal adults with twisted wings emerged from crude neem oil
and NSKE treatments, whereas normal adults of medium in size were emerged from
jatropaha leaf extract, pongamia seed extract treatments and control.
Effect of plant products on weight of P.xylostella larvae revealed that the larvae
reared on neem oil treated leaves recorded less weight gain (1.86 mg) compared to
control (2.93 mg). In all the treatments the weight of the larvae increased gradually from
first day after feeding to fifth day after feeding.
 
Date 2016-07-30T14:27:51Z
2016-07-30T14:27:51Z
2008
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/70316
 
Language en
 
Relation D8334;
 
Format application/pdf
 
Publisher ACHARYA N. G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD