Document Detail

The toxic effects of neem extract and azadirachtin on the brown planthopper, Nilaparvata lugens (Stål) (BPH) (Homoptera: Delphacidae).
MedLine Citation:
PMID:  17113126     Owner:  NLM     Status:  MEDLINE    
Extracts of neem (Azadirachta indica A. Juss) are used in the developing world for many purposes including management of agricultural insect pests. The effects of different neem extracts (aqueous (NSKEaq), ethanol (NSKEeth) and hexane (NSKEhex)) on mortality, survival and weight of the brown planthopper, Nilaparvata lugens (Stål) (BPH) (Homoptera: Delphacidae) third and fourth nymphal instars were investigated. When fed rice plants treated with neem derivatives in bioassays, the survival of BPH nymphs is affected. Comparisons were made with the pure neem limonoid, azadirachtin (AZA) to ascertain its role as a compound responsible for these effects. AZA was most potent in all experiments and produced almost 100% nymphal mortality at 0.5 ppm and higher concentrations. When higher concentrations were applied, the effects appeared shortly after treatment and mortality was higher. Many insects died after remaining inactive for several days or during prolonged moulting. At lower concentrations, if moulting was achieved, disturbed growth and abnormalities were then likely to occur in the moulting process. Nymphs that were chronically exposed to neem extract showed a reduction in weight (45-60%). The results clearly indicate the simple NSKE (aqueous, ethanolic or both), containing low concentrations of AZA, can be used effectively to inhibit the growth and survival of BPH.
Sengottayan Senthil Nathan; Man Young Choi; Chae Hoon Paik; Hong Yul Seo; Jae Duk Kim; Seok Min Kang
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-11-17
Journal Detail:
Title:  Chemosphere     Volume:  67     ISSN:  0045-6535     ISO Abbreviation:  Chemosphere     Publication Date:  2007 Feb 
Date Detail:
Created Date:  2007-01-22     Completed Date:  2007-04-02     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0320657     Medline TA:  Chemosphere     Country:  England    
Other Details:
Languages:  eng     Pagination:  80-8     Citation Subset:  IM    
Plant Environment Division, Honam Agricultural Research Institute (HARI), National Institute of Crop Science (NICS), Rural Development Administration (RDA), #381 Songhak-dong, Iksan, Chonbuk, 570-080, Republic of Korea.
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MeSH Terms
Azadirachta / chemistry*
Hemiptera / drug effects*,  growth & development
Limonins / chemistry,  toxicity*
Molecular Structure
Nymph / drug effects
Plant Extracts / toxicity*
Reg. No./Substance:
0/Limonins; 0/Plant Extracts; 11141-17-6/azadirachtin

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