Oils for Summer Control of Pear Psylla and Their Effects on Pear Trees1

Author： ZWICK R. W.   PEIFER F. W.  

Publisher： Entomological Society of America

ISSN： 1938-291X

Source： Journal of Economic Entomology, Vol.61, Iss.4, 1968-08, pp. : 1075-1079

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