Some Field Tests Showing the Comparative Efficiency of Derris, Pyrethrum and Hellebore Powders on Different Insects

Author： HAMILTON CLYDE C.   GEMMELL LOUIS G.  

Publisher： Entomological Society of America

ISSN： 1938-291X

Source： Journal of Economic Entomology, Vol.27, Iss.2, 1934-04, pp. : 446-453

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