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Growth inhibitory and antifeedant effect of azadirachtin-rich formulations on cotton bollworm (Helicoverpa armigera)

Indian Agricultural Research Journals

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Title Growth inhibitory and antifeedant effect of azadirachtin-rich formulations on cotton bollworm (Helicoverpa armigera)
 
Creator GUPTA, G P
BIRAH, A
 
Subject Helicoverpa armigera, Antifeedant, Azadirachtin, Growth, Development
 
Description Diet-incorporation bioassays were carried out during 1999-2000 to evaluate effects of azadirachtin-rich fractions (Achook, az. 1 500 ppm, Neemazal, az. 50 000 ppm and Neem Jeevan Triguard, az. 60 000 ppm) against cotton bollworm (Helicoverpa armigera Hubner). The larval mortality increased in a dose-dependent manner with the LC50 of 0.612, 0.064 and 0.027% for Achook, Neemazal and Triguard respectively. At lower doses of azadirachtin, inhibition and disruption of moulting was observed, however, larval-pupal intermediates or abnormal pupae were commonly found in all the 3 neem or margosa (Azadirachta indica A. Juss.) formulations tested. The lower concentration 0.075% Neemazal and 0.05% Triguard resulted in 8.0 and 14.6% malformed adults, whereas their percentage decreased with an increase in concentration of neem. It showed that larvae treated with azadirachtin-rich fractions did not develop further stages or if developed into adults, died during eclosion or showed frizzled or curled wings of cotton bollworm.
 
Publisher The Indian Journal of Agricultural Sciences
 
Contributor —
 
Date 2014-04-16
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
 
Format application/pdf
 
Identifier http://epubs.icar.org.in/ejournal/index.php/IJAgS/article/view/39802
 
Source The Indian Journal of Agricultural Sciences; Vol 71, No 5 (2001)
0019-5022
 
Language eng
 
Relation http://epubs.icar.org.in/ejournal/index.php/IJAgS/article/view/39802/17907
 
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