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Antifeedant and growth regulatory effects of gudmar, Gymnema sylvestre against Spodoptera litura (Fabricius)

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Title Antifeedant and growth regulatory effects of gudmar, Gymnema sylvestre against Spodoptera litura (Fabricius)
Ph D
 
Creator Jaipal Singh Choudhary
 
Contributor Chitra Srivastava
 
Subject extraction, animal developmental stages, concentrates, biological phenomena, antifeedants, allelochemicals, biological development, carbohydrates, planting, plant extracts
 
Description T-8358
Abstract Antifeedant activity of various extracts of Gymnema sylvestre leaves viz. GS 1,
GS 2, GS 3, GS 4, GS 5, GS 6, GS 7, GS 8, GS 9, GS 10, pure compound (GS 11) and
azadirachtin (50%) was investigated against third instar larvae of Spodoptera litura
through choice as well as no choice method. Activity was observed after 24 and 48 hours.
Based on antifeedancy at individual doses, lethal concentration of antifeedant activity
(AI50) of each extract, pure compound and technical azadirachtin (50%) was calculated.
Antifeedant activity of various extracts was compared based on their AI50 values. It was
observed that extract GS 9 showed lowest AI50 value (0.047%) followed by azadirachtin
(0.086%) through no-choice test method observed after 24 hours. The order of
antifeedancy in increasing order was GS 5 > GS 3 > GS 2 > GS 10 > GS 11 > GS 7 > GS
8 > GS 1 > GS 6 > GS 4. Extract GS 9 showed better antifeedancy compared to
azadirachtin. The lowest antifeedancy was observed with GS 5 which showed 19.50
times higher AI50 value as compare azadirachtin after 24 hours of treatment. The pure
compound stigmasterol could not show good activity as AI50 was 11.8 times higher than
azadirachtin. When the antifeedant activity of various extracts and pure compound was
observed through choice method after 24 hours again extract GS 9 showed lowest AI50 as
0.036% followed by GS 8 (0.037%). Both these extracts showed higher antifeedancy
compare to azadirachtin. In the present study pure compound GS 11 could not show good
antifeedant activity whereas extract GS 9 showed very good antifeedancy which was
better than azadirachtin through no-choice method and next to azadirachtin through
choice method
 
Date 2016-10-24T14:55:53Z
2016-10-24T14:55:53Z
2010
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/81545
 
Format application/pdf
 
Publisher IARI,DIVISION OF ENTMOLOGY