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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