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
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Creator |
NARAHARI, K
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Contributor |
SATYANARAYANA, J
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Subject |
BIOCHEMICAL, CHANGES, Spodoptera, litura, Fab, TREATMENT, PLANT, PRODUCTS
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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. |
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Date |
2016-07-30T14:27:51Z
2016-07-30T14:27:51Z 2008 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/70316
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Language |
en
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Relation |
D8334;
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Format |
application/pdf
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Publisher |
ACHARYA N. G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD
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