TY  - BOOK
AU  - Nyvall , Robert F
TI  - Field crop deseases
SN  - 0813820790
U1  - 632 
PY  - 1999///
CY  - USA
PB  - Lowa State University Press 
KW  - FIELD CROPS PLANT DISEASES
KW  - PHYTOPATHOGENIC MICROORGANISMS CONTROL
ER  -