Symposium on the Role Weeds and Wild Plants in the Ecology of Crop Pests and Diseases, Uuniversity of York, April15-17, 1980 <br/><br/>
Pests,pathogens and vegetation  the role of weeds and wild plants in the papers 

 -  1981 
<br/><br/><label>Dewey Class. No.: </label>632.58  / S99P