TY  - BOOK
AU  - Zwick, R. W.
TI  - Probloompetroleum oil aplications for delaying pear psilla (Homoptera: Psyllidae) oviposition 
CY  - s.l.
PB  -  s.n.
KW  - Control de plagas
KW  - Pera
KW  -  plagas
KW  - Psylla pyricola
N1  - Sobretiro de: The Canadian Entomologist, 110 (3), 1978
ER  -