Present Status of Biological Control of the Pear Psylla in Southern Oregon1

Author： WESTIGARD P. H.   GENTNER L. G.   BERRY D. W.  

Publisher： Entomological Society of America

ISSN： 1938-291X

Source： Journal of Economic Entomology, Vol.61, Iss.3, 1968-06, pp. : 740-743

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