Document Detail

Effect of sublethal concentration of Bacillus thuringiensis var. kurstaki on food and developmental needs of the american bollworm, Helicoverpa armigera (Hübner).
MedLine Citation:
PMID:  11906106     Owner:  NLM     Status:  MEDLINE    
Effect of sublethal concentration of B. thuringiensis on the first, third, fourth and fifth instar larvae of the American bollworm, H. armigera was investigated to study their response to food consumption, digestion, utilization, and their development till adult formation. The young larvae surviving B. thuringiensis treatment in their first instar and third instar delayed larval period by two to three days, but did not consume more food as compared to control. However, they showed higher digestibility of food as compared to control, which was compensated by their reduced ability to utilize the digested food for body substance. Contrary to the effect on first and third instar larvae, the fifth instar larvae surviving B. thuringiensis treatment in its fourth instar consumed less food, showed less absorption efficiency in digesting food, but compensated by increase in the utilization of ingested and digested food into body substance. Insects surviving B. thuringiensis HD-1 sublethal toxicity adapted to normal larval growth when fed on untreated food, depending upon insect growth prior to treatment. The moths emerging from B.thuringiensis treated larvae had sex ratio favouring females, and adult pairs laid less fertile eggs than those from the untreated ones. The response of B. thuringiensis treated larvae to their food and developmental needs is discussed.
G T Gujar; V Kalia; A Kumari
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Indian journal of experimental biology     Volume:  39     ISSN:  0019-5189     ISO Abbreviation:  Indian J. Exp. Biol.     Publication Date:  2001 Nov 
Date Detail:
Created Date:  2002-03-21     Completed Date:  2002-05-06     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0233411     Medline TA:  Indian J Exp Biol     Country:  India    
Other Details:
Languages:  eng     Pagination:  1130-5     Citation Subset:  IM    
Division of Entomology, Indian Agricultural Research Institute, New Delhi.
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MeSH Terms
Bacillus thuringiensis / pathogenicity*
Larva / growth & development,  microbiology
Moths / growth & development*,  microbiology*

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