This paper deals with the insect diversity and the related plants community in apple orchards and their surroundings in Luochuan and Huangling Counties in the Loess Plateau, the well-known high quality apple-growing region of China. The insect diversities in apple orchards with different composition of plant community are investigated, and the dominant wild plant species are determined according to the species importance values (IV). The effects of wild plants and crops on the insect diversity and populatio...