Document Detail

Identification of host kairomones from maize, Zea mays, for the maize weevil, Sitophilus zeamais.
MedLine Citation:
PMID:  23053917     Owner:  NLM     Status:  MEDLINE    
The maize weevil, Sitophilus zeamais, is an economically important pest of stored grains in tropical and subtropical regions of the world. The behavioral responses of adult S. zeamais to volatile organic compounds (VOCs) from maize seeds, Zea mays, were studied to identify semiochemicals used in host location and provide potential tools for managing this pest. VOCs released directly from crude seed extracts, vacuum distilled extracts, hexane and diethyl ether fractions from silica gel chromatography of the vacuum distillates, air entrainment samples, and identified volatile compounds were assayed using a Perspex four-arm olfactometer. Weevils spent significantly more time, and made a higher number of visits, to the region of the olfactometer where Z. mays volatiles were present than in control regions comprising solvent only. When white and yellow Z. mays VOCs were compared in a choice test, the mean time spent in the two olfactometer treatment arms was significantly greater than the mean time spent in the control arms. However, weevils did not show any preference for either of the two treatments, thus demonstrating that both varieties of maize have similar activity. Gas chromatography (GC), coupled gas chromatography-mass spectrometry (GC-MS), GC peak enhancement and electroantennography (EAG) identified hexanal, (E)-2-heptenal, and octanal as biologically active compounds in air entrainment samples and diethyl ether fractions of vacuum distillates. A 3-component synthetic blend of the identified compounds was significantly attractive to both sexes of the weevil. These host kairomones could be deployed in semiochemical based monitoring and management of S. zeamais in the tropics.
Donald A Ukeh; Christine M Woodcock; John A Pickett; Michael A Birkett
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-10-11
Journal Detail:
Title:  Journal of chemical ecology     Volume:  38     ISSN:  1573-1561     ISO Abbreviation:  J. Chem. Ecol.     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-30     Completed Date:  2013-05-07     Revised Date:  2014-10-14    
Medline Journal Info:
Nlm Unique ID:  7505563     Medline TA:  J Chem Ecol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1402-9     Citation Subset:  IM    
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MeSH Terms
Behavior, Animal / drug effects
Gas Chromatography-Mass Spectrometry
Pest Control, Biological
Pheromones / chemistry*
Seeds / chemistry
Volatile Organic Compounds / chemistry,  pharmacology
Weevils / drug effects*,  physiology
Zea mays / chemistry*,  parasitology
Grant Support
BBS/E/C/00005194//Biotechnology and Biological Sciences Research Council; //Biotechnology and Biological Sciences Research Council
Reg. No./Substance:
0/Pheromones; 0/Volatile Organic Compounds

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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