Helyer, Neil <br/><br/>
Colour Handbook of Biological Control in Plant Protection 

 - Spain  Royal Horticultural Society  2003 
<br/><br/><label>Subjects--Uniform Titles: </label>--Post Graduate Reference
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agricultural pests--Biological pest control agentsNatural pesticides Protection of PlantsBotany
<br/><br/><label>Dewey Class. No.: </label>632.96  / HEL-C