Combined Effects of Spirea Aphid (Homoptera: Aphididae) and Nitrogen Fertilization on Net Photosynthesis, Total Chlorophyll Content, and Greenness of Apple Leaves

Author： KAAKEH W.   PFEIFFER D. G.   MARINI R. P.  

Publisher： Entomological Society of America

ISSN： 1938-291X

Source： Journal of Economic Entomology, Vol.85, Iss.3, 1992-06, pp. : 939-946

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