Zwick, R. W. <br/><br/>
Integrated control of pear Psylla in Oregon's Hood River Valley / 
R.W. Zwick and G.J. Fields 
 - Corvallis :   Agricultural Experiment Station 
 - 8 p. 
 - Circular of information; 660 .
<br/><br/><label>LCCN: </label>205515 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Control de Plagas<br/>Pera -- plagas <br/>Psylla pyricola