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Two New Species of Parasitoids on Scale Insects on Fruit Tree (Hymenoptera:Encyrtidae) A Study on the Nutriology Promoting the Population Increase of Eulecanium gigantea by Urban Pollution RESEARCH ON THE TECHNIQUE OF DRIP IRRIGATION UNDER FILM FORCASH-TREES PLANTED IN FISH-SCALE PITS ON LOESS SLOPE-LAND Spatial variation of soil organic carbon of croplands in hilly Loess Plateau region of China——A case study in Zhuanglang County, Gansu Province Optical and Electron Microscopic Studies to Differentiate Garter Snake (Zaocys dhumunades) from Its Fake Adulterants Study on the Major Host Plant Species of Lac Insect, Wax Scale and Gall Aphids The Ultra-Morphology and Chemical Composition of Waxes Secreted by a Scale Insect Physokermes shanxiensis (Homoptera : Coccidae) Analysis on Multi-Species and Multi-Scale Pattern of Ammopiptanthus mongolicus Communities Outside Oases