TY  - BOOK
AU  - Van der Werf,W.
TI  - Yellowing viruses in sugarbeet, epidemiology and damage
PY  - 1988///
CY  - Wageningen
PB  - Landbouwuniversiteit
KW  - Yellowing Viruses
KW  - Sugarbeet
KW  - Epidemiology
ER  -