Document Detail

Response and effect of two plant crude extracts on mosquito larvae Culex pipiens.
MedLine Citation:
PMID:  17217029     Owner:  NLM     Status:  MEDLINE    
The response and effect of two plant crude extract from dry Damsissa (Ambrosia maritima) and Neem seeds (Azadirachta indica) were tested against the first and third instar larvae of mosquito (Culex pipiens). The results showed that both extracts had a larvicidal effect. Neem seed extract was more toxic than Damsissa extract against both the first and third instar larvae. In addition, the young larvae (first instar) were more susceptible to Neem seeds than the old ones (third instar) as revealed from the LC50 values, while Damsissa showed nearly the same effect against both stages. Meanwhile, treatment of Neem seed extracts resulted in prolongation of the larval period accompanied with a decrease in larval activity. Moreover, the effect of the two extracts on larval total esterase isozymes was examined. Neem extract showed an adverse effect on the third instar larvae, since only one band (E1) was observed and the other 4 bands disappeared at all concentrations used, as compared with untreated control larvae (El, E2, E3, E4, and E5). Meanwhile, Damsissa extract treatment of the third instar larvae showed an additional band located between E3 and E4, and the absence of two bands (E2 and E3) after treatment with 0.5x10(4), 1x10(4) and 1.5x10(4) ppm, while treatment with 0.25x10(4) ppm did not result in any changes in larval total esterase.
N A El-Ela; M Talha; A A El-Aziz
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of the Egyptian Public Health Association     Volume:  73     ISSN:  0013-2446     ISO Abbreviation:  J Egypt Public Health Assoc     Publication Date:  1998  
Date Detail:
Created Date:  2007-01-12     Completed Date:  2007-02-16     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7505602     Medline TA:  J Egypt Public Health Assoc     Country:  Egypt    
Other Details:
Languages:  eng     Pagination:  649-65     Citation Subset:  IM    
Tropical Health Dept., High Institute of Public Health, Alexandria University.
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MeSH Terms
Confidence Intervals
Dose-Response Relationship, Drug
Insect Vectors
Insecticide Resistance
Larva* / physiology
Lethal Dose 50
Linear Models
Mosquito Control / methods
Plant Extracts*
Reg. No./Substance:
0/Insecticides; 0/Plant Extracts; EC 3.1.-/Esterases

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