Not enough known.  [electronic resource] 

 -  Nature  Jan 1969 
 - 302-3 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0028-0836 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Food<br/>Pesticides