Berrg, Henk van den <br/><br/>
Natural control of helocoverpa armigera in small holder crops in East Africa 

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<br/><br/>  Thesis Wageningen 
<br/><br/><label>ISBN: </label>90-5485-107-4 
<br/><br/><label>ISSN: </label>
<br/><br/><label>Subjects--Index Terms: </label>Helicoverpa armigera 
<br/><br/><label>Dewey Class. No.: </label>633.1