TY  - BOOK
AU  - Symposium on the Role Weeds and Wild Plants in the Ecology of Crop Pests and Diseases, Uuniversity of York, April15-17, 1980
AU  - Thresh, J.M. ed.
TI  - Pests,pathogens and vegetation: the role of weeds and wild plants in the papers
U1  - 632.58 
PY  - 1981///
ER  -