TY  - BOOK
AU  - Zwick, R. W.
AU  - Fields, G.J.
TI  - Integrated control of pear Psylla in Oregon's Hood River Valley
CY  - Corvallis
PB  -  Agricultural Experiment Station
KW  - Control de Plagas
KW  - Pera
KW  -  plagas
KW  - Psylla pyricola
ER  -