Yothers, M. A <br/><br/>
Observations on the biology and control of the treehopper Heliria praealta (Fowler) in orchards of the pacific north west  / 
by M. A. Yothers and Paul B. Allen 
 - Washington  :   Department of Agriculture 
 - 12 p. 
 - EUA. Depart. of Agriculture Circular; 606 .
<br/><br/><label>LCCN: </label>202900 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Heliria  Membracidae  Control de plagas